mailq lockups

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mailq lockups

Joey-16

Hello All,

I need some help with message that seem to get stuck in the outgoing queue in some cases for days.

 

This is what I find in the log files:

May  5 10:44:48 houston postfix/smtp[5448]: 3F18D2A08A6: to=<[hidden email]>, relay=none, delay=177852, delays=177852/0.03/0.09/0, dsn=4.4.1, status=deferred (connect to myserver.server.net[28.144.16.5]:25: Connection refused)

May  5 10:44:48 houston postfix/smtp[5449]: 518A52A080A: to=<[hidden email]>, relay=none, delay=82012, delays=82012/0.03/0.08/0, dsn=4.4.1, status=deferred (connect to myserver.server.net[28.144.165.5]:25: Connection refused)

 

 

Mailq shows:

 

3F18D2A08A6*    6389 Sat May  3 09:20:37  [hidden email]

                                         [hidden email]

 

 

Default Timeouts are in effect and show this:

connection_cache_protocol_timeout = 5s

daemon_timeout = 18000s

ipc_timeout = 3600s

lmtp_connect_timeout = 0s

lmtp_data_done_timeout = 600s

lmtp_data_init_timeout = 120s

lmtp_data_xfer_timeout = 180s

lmtp_lhlo_timeout = 300s

lmtp_mail_timeout = 300s

lmtp_quit_timeout = 300s

lmtp_rcpt_timeout = 300s

lmtp_rset_timeout = 20s

lmtp_starttls_timeout = 300s

lmtp_tls_session_cache_timeout = 3600s

lmtp_xforward_timeout = 300s

milter_command_timeout = 30s

milter_connect_timeout = 30s

milter_content_timeout = 300s

qmqpd_timeout = 300s

smtp_connect_timeout = 30s

smtp_data_done_timeout = 600s

smtp_data_init_timeout = 120s

smtp_data_xfer_timeout = 180s

smtp_helo_timeout = 300s

smtp_mail_timeout = 300s

smtp_quit_timeout = 300s

smtp_rcpt_timeout = 300s

smtp_rset_timeout = 20s

smtp_starttls_timeout = 300s

smtp_tls_session_cache_timeout = 3600s

smtp_xforward_timeout = 300s

smtpd_policy_service_timeout = 100s

smtpd_proxy_timeout = 100s

smtpd_starttls_timeout = 300s

smtpd_timeout = 300s

smtpd_tls_session_cache_timeout = 3600s

trigger_timeout = 10s

 

 

On the receiving exchange side timeouts are set to 120seconds, but we have seen connections up to 10 days remain active on both the exchange server and the postfix server.

 

 

Any help appreciated!

 

Joey

 

 

 

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Re: mailq lockups

Victor Duchovni
On Mon, May 05, 2008 at 12:09:51PM -0400, Joey wrote:

> I need some help with message that seem to get stuck in the outgoing queue
> in some cases for days.
>
> This is what I find in the log files:
>
> May  5 10:44:48 houston postfix/smtp[5448]: 3F18D2A08A6:
> to=<[hidden email]>, relay=none, delay=177852,
> delays=177852/0.03/0.09/0, dsn=4.4.1, status=deferred (connect to
> myserver.server.net[28.144.16.5]:25: Connection refused)
>
> May  5 10:44:48 houston postfix/smtp[5449]: 518A52A080A:
> to=<[hidden email]>, relay=none, delay=82012,
> delays=82012/0.03/0.08/0, dsn=4.4.1, status=deferred (connect to
> myserver.server.net[28.144.165.5]:25: Connection refused)
>

Don't blame the messenger. Postfix cannot connect to the destination
server which is refusing connections (returns "RST" 80ms or less after
"SYN"). Look for Exchange expertise to determine why the Exchange server
is refusing connections.

See also:

    http://www.postfix.org/QSHAPE_README.html#backlog

--
        Viktor.

Disclaimer: off-list followups get on-list replies or get ignored.
Please do not ignore the "Reply-To" header.

To unsubscribe from the postfix-users list, visit
http://www.postfix.org/lists.html or click the link below:
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If my response solves your problem, the best way to thank me is to not
send an "it worked, thanks" follow-up. If you must respond, please put
"It worked, thanks" in the "Subject" so I can delete these quickly.
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Re: mailq lockups

Jan P. Kessler-2
In reply to this post by Joey-16
Joey schrieb:

>
> Hello All,
>
> I need some help with message that seem to get stuck in the outgoing
> queue in some cases for days.
>
>  
>
> This is what I find in the log files:
>
> May  5 10:44:48 houston postfix/smtp[5448]: 3F18D2A08A6:
> to=<[hidden email]>, relay=none, delay=177852,
> delays=177852/0.03/0.09/0, dsn=4.4.1, status=deferred (connect to
> myserver.server.net[28.144.16.5]:25: Connection refused)
>
> May  5 10:44:48 houston postfix/smtp[5449]: 518A52A080A:
> to=<[hidden email]>, relay=none, delay=82012,
> delays=82012/0.03/0.08/0, dsn=4.4.1, status=deferred (connect to
> myserver.server.net[28.144.165.5]:25: Connection refused)
>
'Connection refused' means that the remote host (or a firewall in
between) answered with a tcp reset. This happens for example when the
smtp service is unavailable.

BTW: Is this really no mistake?

May  5 10:44:48 houston postfix/smtp[5448]: ... (connect to
myserver.server.net[28.144.16.5]:25: Connection refused)

May  5 10:44:48 houston postfix/smtp[5449]: ... (connect to
myserver.server.net[28.144.165.5]:25: Connection refused)

(note the different ip adresses, 3rd octet)


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Re: mailq lockups

Noel Jones-2
In reply to this post by Joey-16
Joey wrote:

> Hello All,
>
> I need some help with message that seem to get stuck in the outgoing
> queue in some cases for days.
>
>  
>
> This is what I find in the log files:
>
> May  5 10:44:48 houston postfix/smtp[5448]: 3F18D2A08A6:
> to=<[hidden email]>, relay=none, delay=177852,
> delays=177852/0.03/0.09/0, dsn=4.4.1, status=deferred (connect to
> myserver.server.net[28.144.16.5]:25: Connection refused)
>
> May  5 10:44:48 houston postfix/smtp[5449]: 518A52A080A:
> to=<[hidden email]>, relay=none, delay=82012,
> delays=82012/0.03/0.08/0, dsn=4.4.1, status=deferred (connect to
> myserver.server.net[28.144.165.5]:25: Connection refused)
>

"Connection refused" is not a timing error.  You are
contacting a remote system at IP 28.144.{165 or 16}.5, and it
is refusing connections from you.
Common causes of this may include:
- remote system mail service is stopped.
- remote mail system isn't listening on port 25
- remote system has blocked you with a firewall.

Is postfix contacting the right IP address?  If not, maybe you
have a problem with your MX lookups or your transport table.

You may be able to diagnose this somewhat by trying to telnet
to port 25 on the remote system from some different source
IP's, but likely the fix will need to be made on the other end.

--
Noel Jones
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Re: mailq lockups

Ralf Hildebrandt
In reply to this post by Joey-16
* Joey <[hidden email]>:

> Hello All,
>
> I need some help with message that seem to get stuck in the outgoing queue
> in some cases for days.
>
>  
>
> This is what I find in the log files:
>
> May  5 10:44:48 houston postfix/smtp[5448]: 3F18D2A08A6:
> to=<[hidden email]>, relay=none, delay=177852,
> delays=177852/0.03/0.09/0, dsn=4.4.1, status=deferred (connect to
> myserver.server.net[28.144.16.5]:25: Connection refused)
>
> May  5 10:44:48 houston postfix/smtp[5449]: 518A52A080A:
> to=<[hidden email]>, relay=none, delay=82012,
> delays=82012/0.03/0.08/0, dsn=4.4.1, status=deferred (connect to
> myserver.server.net[28.144.165.5]:25: Connection refused)

If it's refusing connections, then it's refusing connections.
Send snail mail.

--
Ralf Hildebrandt ([hidden email])          [hidden email]
Postfix - Einrichtung, Betrieb und Wartung       Tel. +49 (0)30-450 570-155
http://www.arschkrebs.de
It is easier to change the specification to fit the program than vice versa.
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RE: mailq lockups

Joey-16
> > myserver.server.net[28.144.16.5]:25: Connection refused)
> >
> > May  5 10:44:48 houston postfix/smtp[5449]: 518A52A080A:
> > to=<[hidden email]>, relay=none, delay=82012,
> > delays=82012/0.03/0.08/0, dsn=4.4.1, status=deferred (connect to
> > myserver.server.net[28.144.165.5]:25: Connection refused)
>
> If it's refusing connections, then it's refusing connections.
> Send snail mail.
>
> --
> Ralf Hildebrandt ([hidden email])          [hidden email]


That makes perfect sense when we have the connection refused, however the mail queue shows the below before we get the refused message:
3F18D2A08A6*    6389 Sat May  3 09:20:37  [hidden email]
                                         [hidden email]

And on the client server side ( exchange ) I see connections up to 10 days... and the connections are still open on our side.
This is where my question about timeouts etc stems from.  ( original post ).


Thanks!



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Re: mailq lockups

Ralf Hildebrandt
* Joey <[hidden email]>:

> > > myserver.server.net[28.144.16.5]:25: Connection refused)
> > >
> > > May  5 10:44:48 houston postfix/smtp[5449]: 518A52A080A:
> > > to=<[hidden email]>, relay=none, delay=82012,
> > > delays=82012/0.03/0.08/0, dsn=4.4.1, status=deferred (connect to
> > > myserver.server.net[28.144.165.5]:25: Connection refused)
> >
> > If it's refusing connections, then it's refusing connections.
> > Send snail mail.
> >
> > --
> > Ralf Hildebrandt ([hidden email])          [hidden email]
>
>
> That makes perfect sense when we have the connection refused, however the mail queue shows the below before we get the refused message:
> 3F18D2A08A6*    6389 Sat May  3 09:20:37  [hidden email]
>                                          [hidden email]

Normal.
Postfix tries to establish a connection, thus the mail is in the
active queue.
 
> And on the client server side ( exchange ) I see connections up to 10 days...

What kind of connections?

> and the connections are still open on our side. This is where my
> question about timeouts etc stems from.  ( original post ).

You could enable verbosity for that client. Or your could sniff the
ethernet pakckets if it's easily reproducable.

--
Ralf Hildebrandt ([hidden email])          [hidden email]
Postfix - Einrichtung, Betrieb und Wartung       Tel. +49 (0)30-450 570-155
http://www.arschkrebs.de
"E-mail - When it absolutely, positively has to get lost at the speed
of light."  - Jerry Vuoso.
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Re: mailq lockups

Victor Duchovni
In reply to this post by Joey-16
On Mon, May 05, 2008 at 03:52:25PM -0400, Joey wrote:

> That makes perfect sense when we have the connection refused, however the mail queue shows the below before we get the refused message:
> 3F18D2A08A6*    6389 Sat May  3 09:20:37  [hidden email]
>                                          [hidden email]

This means the message is in the active queue, it says nothing about
connections. Messages in the active queue destined to a congested
destination wait their turn to be given to a delivery agent for
processing. Your logs show only rapid "Connection refused" errors,
show logging of deliveries that are *not* deferred due to "Connection
refused".

> And on the client server side ( exchange ) I see connections up to 10
> days... and the connections are still open on our side.

You present no evidence of this. If you have stuck deliveries to exchange,
debug (and post details of) the stuck connections, not the ones that
fail as a result of Exchange running out of connection slots.

> This is where my question about timeouts etc stems from.  ( original post ).

The timeouts are irrelevant. Look for broken firewalls, broken path
MTU, ... report detailed facts to support *all* your anecdotal claims.

--
        Viktor.

Disclaimer: off-list followups get on-list replies or get ignored.
Please do not ignore the "Reply-To" header.

To unsubscribe from the postfix-users list, visit
http://www.postfix.org/lists.html or click the link below:
<mailto:[hidden email]?body=unsubscribe%20postfix-users>

If my response solves your problem, the best way to thank me is to not
send an "it worked, thanks" follow-up. If you must respond, please put
"It worked, thanks" in the "Subject" so I can delete these quickly.
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Re: mailq lockups

Noel Jones-2
In reply to this post by Joey-16
Joey wrote:
>
> That makes perfect sense when we have the connection refused, however the mail queue shows the below before we get the refused message:
> 3F18D2A08A6*    6389 Sat May  3 09:20:37  [hidden email]
>                                          [hidden email]

The above doesn't say anything about the deliverability of the
message.

>
> And on the client server side ( exchange ) I see connections up to 10 days... and the connections are still open on our side.
> This is where my question about timeouts etc stems from.  ( original post ).
>

Can you show some evidence of the above?  If true, it would
indicate a serious networking problem.

Use a sniffer to diagnose the connection.

This doesn't sound like a postfix problem.

--
Noel Jones
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RE: mailq lockups

Joey-16
OK first let me clarify that I am not saying postfix is to blame, I think it's exchange, but that’s not the point.
I am looking to understand/learn what is going wrong and see how on the postfix side I can figure out whats going on.
This is happening from 3 postfix servers, and happening to several clients, me being the common factor.

These two links will show you the connections on the exchange side:
http://www.web56.net/ebay/retries1.jpg
http://www.web56.net/ebay/retries2.jpg

My question is 1st: Why does the postfix timeout not drop the connection on the postfix side ( which may or may not drop the exchange side it of course has no control of that ) This shows me the connection is active, and it's longer then the timeouts in postfix.

3F18D2A08A6*    6389 Sat May  3 09:20:37  [hidden email]
                                          [hidden email]


2nd: with the settings I have is there something additional I should be setting to insure I drop my connection if their connection takes too long?


I think these are logical questions to ask and please understand I am not fully versed in all of the high level things that happen during normal and abnormal email communications. Hence why I am here asking....

I will place all the info I can here so you don't have to revert back to the original post.  I am trying to provide as much as I can dig up in order to help see my problem clearer...

Thanks everyone!

Joey

---
When the connection from postfix eventually times out I see :
(conversation with client's server here timed out while sending end of data -- message may be sent more than once)

---
When the connection from postfix is stuck on the clients server I see:
3F18D2A08A6*    6389 Sat May  3 09:20:37  [hidden email]
                                          [hidden email]

---
The log files show me this:
May  5 10:44:48 houston postfix/smtp[5448]: 3F18D2A08A6: to=<[hidden email]>, relay=none, delay=177852, delays=177852/0.03/0.09/0, dsn=4.4.1, status=deferred (connect to myserver.server.net[28.144.16.5]:25: Connection refused) May  5 10:44:48 houston postfix/smtp[5449]: 518A52A080A: to=<[hidden email]>, relay=none, delay=82012, delays=82012/0.03/0.08/0, dsn=4.4.1, status=deferred (connect to myserver.server.net[28.144.165.5]:25: Connection refused)

---
Default Timeouts are in effect and show this:
connection_cache_protocol_timeout = 5s
daemon_timeout = 18000s
ipc_timeout = 3600s
lmtp_connect_timeout = 0s
lmtp_data_done_timeout = 600s
lmtp_data_init_timeout = 120s
lmtp_data_xfer_timeout = 180s
lmtp_lhlo_timeout = 300s
lmtp_mail_timeout = 300s
lmtp_quit_timeout = 300s
lmtp_rcpt_timeout = 300s
lmtp_rset_timeout = 20s
lmtp_starttls_timeout = 300s
lmtp_tls_session_cache_timeout = 3600s
lmtp_xforward_timeout = 300s
milter_command_timeout = 30s
milter_connect_timeout = 30s
milter_content_timeout = 300s
qmqpd_timeout = 300s
smtp_connect_timeout = 30s
smtp_data_done_timeout = 600s
smtp_data_init_timeout = 120s
smtp_data_xfer_timeout = 180s
smtp_helo_timeout = 300s
smtp_mail_timeout = 300s
smtp_quit_timeout = 300s
smtp_rcpt_timeout = 300s
smtp_rset_timeout = 20s
smtp_starttls_timeout = 300s
smtp_tls_session_cache_timeout = 3600s
smtp_xforward_timeout = 300s
smtpd_policy_service_timeout = 100s
smtpd_proxy_timeout = 100s
smtpd_starttls_timeout = 300s
smtpd_timeout = 300s
smtpd_tls_session_cache_timeout = 3600s
trigger_timeout = 10s











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Re: mailq lockups

Victor Duchovni
On Mon, May 05, 2008 at 10:08:29PM -0400, Joey wrote:

> OK first let me clarify that I am not saying postfix is to blame, I think it's exchange, but that???s not the point.
> I am looking to understand/learn what is going wrong and see how on the postfix side I can figure out whats going on.
> This is happening from 3 postfix servers, and happening to several clients, me being the common factor.
>
> These two links will show you the connections on the exchange side:
> http://www.web56.net/ebay/retries1.jpg
> http://www.web56.net/ebay/retries2.jpg

This is sadly useless. This would be a good time to report a complete
"postconf -n".

Look at *your* connection table with

        # lsof tcp@remoteip:25

for each connection in an "ESTABLISHED" state, and a corresponding "smtp"
process id, find the process start time (ps -o pid,stime,comm -p $pid)
and check whether the process reported any previous deliveries between
the start time and the present. The age of the connection (if not cached)
is measured approximately from the later of the process start time and
the last completed delivery report.

If no long-lived connections exist on the Linux end, find out why Exchange
still believes there are unfinished connections (this is where packet
captures and verbose logging are handy).

> My question is 1st: Why does the postfix timeout not drop the connection
> on the postfix side ( which may or may not drop the exchange side it of
> course has no control of that ) This shows me the connection is active,
> and it's longer then the timeouts in postfix.

We have no evidence for the premise (Postfix keeping idle connections
alive for a long time), so it is to early to comment on the veracity
of the conclusion. Postfix will normally terminate a delivery after 5
hours even if the remote end avoids idle timeouts by gradually receiving
trickles of traffic. When you report connections are 12+ hours old
(not 10 days as before), the evidence is not entirely plausible.

> 3F18D2A08A6*    6389 Sat May  3 09:20:37  [hidden email]
>                                           [hidden email]
>
>
> 2nd: with the settings I have is there something additional I should be setting to insure I drop my connection if their connection takes too long?
>

You are jumping to conclusions. First find the real facts of the situation.

> I think these are logical questions to ask and please understand I
> am not fully versed in all of the high level things that happen during
> normal and abnormal email communications. Hence why I am here asking....

The questions are only "logical" if you take major leaps of faith to
accept the ambiguous evidence from the Exchange connection table, and
also accept that the connections are still active on the Postfix side.

It is far more likely that the leaps are unjustified than that Postfix
is actually keeping SMTP connections alive for 12+ hours.

No further progress is possible until you substantiate your conjectures
with detailed research to uncover and report the actual events.

--
        Viktor.

Disclaimer: off-list followups get on-list replies or get ignored.
Please do not ignore the "Reply-To" header.

To unsubscribe from the postfix-users list, visit
http://www.postfix.org/lists.html or click the link below:
<mailto:[hidden email]?body=unsubscribe%20postfix-users>

If my response solves your problem, the best way to thank me is to not
send an "it worked, thanks" follow-up. If you must respond, please put
"It worked, thanks" in the "Subject" so I can delete these quickly.
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RE: mailq lockups

Joey-16
> -----Original Message-----
> From: [hidden email]
[mailto:[hidden email]]
> On Behalf Of Victor Duchovni
> Sent: Monday, May 05, 2008 10:33 PM
> To: 'postfix users list'
> Subject: Re: mailq lockups
>
> On Mon, May 05, 2008 at 10:08:29PM -0400, Joey wrote:
>
> > OK first let me clarify that I am not saying postfix is to blame, I
think
> it's exchange, but that???s not the point.
> > I am looking to understand/learn what is going wrong and see how on the
> postfix side I can figure out whats going on.
> > This is happening from 3 postfix servers, and happening to several
clients,

> me being the common factor.
> >
> > These two links will show you the connections on the exchange side:
> > http://www.web56.net/ebay/retries1.jpg
> > http://www.web56.net/ebay/retries2.jpg
>
> This is sadly useless. This would be a good time to report a complete
> "postconf -n".
>
> Look at *your* connection table with
>
> # lsof tcp@remoteip:25
>
> for each connection in an "ESTABLISHED" state, and a corresponding "smtp"
> process id, find the process start time (ps -o pid,stime,comm -p $pid)
> and check whether the process reported any previous deliveries between
> the start time and the present. The age of the connection (if not cached)
> is measured approximately from the later of the process start time and
> the last completed delivery report.
>
> If no long-lived connections exist on the Linux end, find out why Exchange
> still believes there are unfinished connections (this is where packet
> captures and verbose logging are handy).
>
> > My question is 1st: Why does the postfix timeout not drop the connection
> > on the postfix side ( which may or may not drop the exchange side it of
> > course has no control of that ) This shows me the connection is active,
> > and it's longer then the timeouts in postfix.
>
> We have no evidence for the premise (Postfix keeping idle connections
> alive for a long time), so it is to early to comment on the veracity
> of the conclusion. Postfix will normally terminate a delivery after 5
> hours even if the remote end avoids idle timeouts by gradually receiving
> trickles of traffic. When you report connections are 12+ hours old
> (not 10 days as before), the evidence is not entirely plausible.
>
> > 3F18D2A08A6*    6389 Sat May  3 09:20:37  [hidden email]
> >                                           [hidden email]
> >
> >
> > 2nd: with the settings I have is there something additional I should be
> setting to insure I drop my connection if their connection takes too long?
> >
>
> You are jumping to conclusions. First find the real facts of the
situation.

>
> > I think these are logical questions to ask and please understand I
> > am not fully versed in all of the high level things that happen during
> > normal and abnormal email communications. Hence why I am here asking....
>
> The questions are only "logical" if you take major leaps of faith to
> accept the ambiguous evidence from the Exchange connection table, and
> also accept that the connections are still active on the Postfix side.
>
> It is far more likely that the leaps are unjustified than that Postfix
> is actually keeping SMTP connections alive for 12+ hours.
>
> No further progress is possible until you substantiate your conjectures
> with detailed research to uncover and report the actual events.
>
> --
> Viktor.
>
> Disclaimer: off-list followups get on-list replies or get ignored.
> Please do not ignore the "Reply-To" header.
>
> To unsubscribe from the postfix-users list, visit
> http://www.postfix.org/lists.html or click the link below:
> <mailto:[hidden email]?body=unsubscribe%20postfix-users>
>
> If my response solves your problem, the best way to thank me is to not
> send an "it worked, thanks" follow-up. If you must respond, please put
> "It worked, thanks" in the "Subject" so I can delete these quickly.

I agree with what you are saying.

Definately exchange is keeping those connections open for an excessive
amount of time, and the postfix side does get dropped at some point.
Even after the postfix side drops the connection, exchange still shows them
as open.  It looks like postfix is dropping the connection at about 10
minutes.

On the exchange side those connections remain open and basically don't close
unless terminated.

One thing I noticed is it appears that some messages make it through without
problem, while certain messages which look like they are spam are the ones
locking up.  The exchange server has no anti-spam applications or anti-virus
so that's not what stopping it.  This seems to be true in all 3 servers this
is happening in.



My postconf -n looks like this:
alias_maps = hash:/etc/postfix/aliases
biff = no
body_checks = pcre:/etc/postfix/body_checks
body_checks_size_limit = 21200
bounce_queue_lifetime = 1d
bounce_size_limit = 2048
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
delay_warning_time = 24h
deliver_lock_attempts = 10
disable_vrfy_command = yes
header_checks = regexp:/etc/postfix/header_checks
html_directory = no
inet_interfaces = 122.122.122.122
mail_owner = postfix
mail_spool_directory = /var/spool/mail
mailbox_size_limit = 35000000
mailq_path = /usr/bin/mailq
manpage_directory = /usr/local/man
maximal_queue_lifetime = 5d
message_size_limit = 20000000
mydestination = $myhostname, localhost.$mydomain, $mydomain
myhostname = mail.ispserver.net
mynetworks = 127.0.0.0/8        
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = no
relay_domains = /etc/postfix/backup_domains
relay_recipient_maps = hash:/etc/postfix/backup_domains_recipients,
hash:/etc/postfix/transport_recipients
sample_directory = /etc/postfix
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
show_user_unknown_table_name = no
smtp_bind_address = 122.122.122.122
smtpd_delay_reject = yes
smtpd_hard_error_limit = 3
smtpd_helo_required = yes
smtpd_junk_command_limit = 3
smtpd_recipient_restrictions = reject_invalid_helo_hostname,
reject_non_fqdn_sender, reject_non_fqdn_recipient,
reject_unknown_sender_domain,      reject_unknown_recipient_domain,
permit_mynetworks,      permit_sasl_authenticated,
reject_unauth_destination,        check_helo_access
hash:/etc/postfix/helo_access,        reject_invalid_helo_hostname,
reject_non_fqdn_helo_hostname,        check_policy_service
unix:private/policy,      check_sender_access
hash:/etc/postfix/client_checks,        check_client_access
hash:/etc/postfix/client_checks,   check_sender_access
hash:/etc/postfix/freemail_access,  check_recipient_mx_access
hash:/etc/postfix/mx_access,        reject_unauth_pipelining,
reject_rbl_client zen.spamhaus.org,     reject_rbl_client bl.spamcop.net,
reject_rbl_client dul.dnsbl.sorbs.net,     reject_rbl_client list.dsbl.org,
check_recipient_access hash:/etc/postfix/filtered_domains
smtpd_restriction_classes = from_freemail_host
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
soft_bounce = no
strict_rfc821_envelopes = yes
transport_maps = hash:/etc/postfix/transport,
hash:/etc/postfix/transport_bounce
unknown_address_reject_code = 554
unknown_client_reject_code = 554
unknown_hostname_reject_code = 554
unknown_local_recipient_reject_code = 550


THANKS!

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Re: mailq lockups

Victor Duchovni
On Tue, May 06, 2008 at 08:52:22AM -0400, Joey wrote:

> > This is sadly useless. This would be a good time to report a complete
> > "postconf -n".

Other than some unnecessary duplication or tweaking of defaults, nothing
too unusual there.

> > Look at *your* connection table with
> >
> > # lsof tcp@remoteip:25
> >
> > for each connection in an "ESTABLISHED" state, and a corresponding "smtp"
> > process id, find the process start time (ps -o pid,stime,comm -p $pid)
> > and check whether the process reported any previous deliveries between
> > the start time and the present. The age of the connection (if not cached)
> > is measured approximately from the later of the process start time and
> > the last completed delivery report.
> >
> > If no long-lived connections exist on the Linux end, find out why Exchange
> > still believes there are unfinished connections (this is where packet
> > captures and verbose logging are handy).

So, have you made any progress on this front?

> Definitely exchange is keeping those connections open for an excessive
> amount of time, and the postfix side does get dropped at some point.
> Even after the postfix side drops the connection, exchange still shows them
> as open.  It looks like postfix is dropping the connection at about 10
> minutes.

And the logs for those events? If the non-refused connections consistently
fail after ~10 minutes, that's the "smtp_data_done_timeout" which means
Postfix sends "." and Exchange fails to respond.

    - Understand Path MTU, and determine whether that's an issue

    - Understand what firewalls are between you and the servers in
    question.

    - Consider disabling PIPELINING to Exchange, because older versions
    (or broken firewalls) may mishandle "<CRLF>.<CRLF>QUIT<CRLF>".

> On the exchange side those connections remain open and basically don't close
> unless terminated.

Exchange really should NOT be allowing client connections to sit idle
for 12 hours tying up resources. What prehistoric version of the software
are these sites running?

> One thing I noticed is it appears that some messages make it through without
> problem, while certain messages which look like they are spam are the ones
> locking up.  The exchange server has no anti-spam applications or anti-virus
> so that's not what stopping it.  This seems to be true in all 3 servers this
> is happening in.

Message size may have a lot to do with if the issue is path MTU. Message
size also changes how packets are emitted, and may alter how PIPELINING
interacts with Exchange.

    - Fix the firewalls if too much ICMP is blocked.

    - Fix the firewalls if they inspect SMTP and are confused by
    PIPELINING

    - Disable PIPELINING to Exchange (smtp_discard_ehlo_keywords)
    if Exchange PIPELINING is buggy.

--
        Viktor.

Disclaimer: off-list followups get on-list replies or get ignored.
Please do not ignore the "Reply-To" header.

To unsubscribe from the postfix-users list, visit
http://www.postfix.org/lists.html or click the link below:
<mailto:[hidden email]?body=unsubscribe%20postfix-users>

If my response solves your problem, the best way to thank me is to not
send an "it worked, thanks" follow-up. If you must respond, please put
"It worked, thanks" in the "Subject" so I can delete these quickly.
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RE: mailq lockups

Joey-16
In reply to this post by Joey-16

> -----Original Message-----

> From: [hidden email]

> [mailto:[hidden email]]

> On Behalf Of Victor Duchovni

> Sent: Tuesday, May 06, 2008 1:29 PM

> To: [hidden email]

> Subject: Re: mailq lockups

>

> On Tue, May 06, 2008 at 08:52:22AM -0400, Joey wrote:

>

> > > This is sadly useless. This would be a good time to report a

> > > complete "postconf -n".

>

> Other than some unnecessary duplication or tweaking of defaults,

> nothing too unusual there.

>

> > > Look at *your* connection table with

> > >

> > >       # lsof tcp@remoteip:25

> > >

> > > for each connection in an "ESTABLISHED" state, and a corresponding "smtp"

> > > process id, find the process start time (ps -o pid,stime,comm -p

> > > $pid) and check whether the process reported any previous

> > > deliveries between the start time and the present. The age of the

> > > connection (if not cached) is measured approximately from the

> > > later of the process start time and the last completed delivery report.

> > >

> > > If no long-lived connections exist on the Linux end, find out why

> > > Exchange still believes there are unfinished connections (this is

> > > where packet captures and verbose logging are handy).

>

> So, have you made any progress on this front?

 

No progress yet...

 

>

> > Definitely exchange is keeping those connections open for an

> > excessive amount of time, and the postfix side does get dropped at some point.

> > Even after the postfix side drops the connection, exchange still

> > shows them as open.  It looks like postfix is dropping the

> > connection at about 10 minutes.

>

> And the logs for those events? If the non-refused connections

> consistently fail after ~10 minutes, that's the

> "smtp_data_done_timeout" which means Postfix sends "." and Exchange fails to respond.

>

>     - Understand Path MTU, and determine whether that's an issue

>

>     - Understand what firewalls are between you and the servers in

>     question.

>

>     - Consider disabling PIPELINING to Exchange, because older versions

>     (or broken firewalls) may mishandle "<CRLF>.<CRLF>QUIT<CRLF>".

>

> > On the exchange side those connections remain open and basically

> > don't close unless terminated.

>

> Exchange really should NOT be allowing client connections to sit idle

> for 12 hours tying up resources. What prehistoric version of the

> software are these sites running?

 

Running server 2003 & exchange 2003 nothing outdated there...

 

>

> > One thing I noticed is it appears that some messages make it through

> > without problem, while certain messages which look like they are

> > spam are the ones locking up.  The exchange server has no anti-spam

> > applications or anti-virus so that's not what stopping it.  This

> > seems to be true in all 3 servers this is happening in.

>

> Message size may have a lot to do with if the issue is path MTU.

> Message size also changes how packets are emitted, and may alter how

> PIPELINING interacts with Exchange.

>

>     - Fix the firewalls if too much ICMP is blocked.

>

>     - Fix the firewalls if they inspect SMTP and are confused by

>     PIPELINING

>

>     - Disable PIPELINING to Exchange (smtp_discard_ehlo_keywords)

>     if Exchange PIPELINING is buggy.

>

Will try this now...

 

So create smtp_discard_ehlo_keyword_address_maps = hash:/etc/postfix/mapname

 

And in the mapname file put:

Client-domain.com pipelining

 

I only see the 3 options of: pipelining, starttls, auth in the doc I see, should it bee nopipelining?

 

 

Thanks!

 

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Re: mailq lockups

Victor Duchovni
On Wed, May 07, 2008 at 02:27:11PM -0400, Joey wrote:

> > Exchange really should NOT be allowing client connections to sit idle
>
> > for 12 hours tying up resources. What prehistoric version of the
>
> > software are these sites running?
>
>  
>
> Running server 2003 & exchange 2003 nothing outdated there...
>

The double-spacing really makes it hard to read and reply to your mail
properly, can you try to turn that off?

> >     - Disable PIPELINING to Exchange (smtp_discard_ehlo_keywords)
> >     if Exchange PIPELINING is buggy.
>
> Will try this now...
>
> So create smtp_discard_ehlo_keyword_address_maps = hash:/etc/postfix/mapname

Easier to turn it off globally for a dedicated transport:

    main.cf:
        # Use "cdb" if available
        default_database_type = hash
        indexed = ${default_database_type}:${config_directory}/

        disable_pipelining = PIPELINING, silent-discard
        transport_maps = ${indexed}transport

    master.cf:
    smtplite  unix  -       -       n       -       -       smtp
          -o smtp_discard_ehlo_keywords=$disable_pipelining

    transport:
    example.com smtplite
   

> And in the mapname file put:
>
> Client-domain.com pipelining

No, this only works for IP addresses, but the transport based approach
above works for domains.

> I only see the 3 options of: pipelining, starttls, auth in the doc I see,
> should it bee nopipelining?

No it should be "pipelining", because this is a *discard* keywords list.

--
        Viktor.

Disclaimer: off-list followups get on-list replies or get ignored.
Please do not ignore the "Reply-To" header.

To unsubscribe from the postfix-users list, visit
http://www.postfix.org/lists.html or click the link below:
<mailto:[hidden email]?body=unsubscribe%20postfix-users>

If my response solves your problem, the best way to thank me is to not
send an "it worked, thanks" follow-up. If you must respond, please put
"It worked, thanks" in the "Subject" so I can delete these quickly.
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RE: mailq lockups

Joey-16
> -----Original Message-----
> From: [hidden email]
[mailto:[hidden email]]

> On Behalf Of Victor Duchovni
> Sent: Wednesday, May 07, 2008 2:35 PM
> To: [hidden email]
> Subject: Re: mailq lockups
>
> On Wed, May 07, 2008 at 02:27:11PM -0400, Joey wrote:
>
> > > Exchange really should NOT be allowing client connections to sit idle
> >
> > > for 12 hours tying up resources. What prehistoric version of the
> >
> > > software are these sites running?
> >
> >
> >
> > Running server 2003 & exchange 2003 nothing outdated there...
> >
>
> The double-spacing really makes it hard to read and reply to your mail
> properly, can you try to turn that off?
>
> > >     - Disable PIPELINING to Exchange (smtp_discard_ehlo_keywords)
> > >     if Exchange PIPELINING is buggy.
> >
> > Will try this now...
> >
> > So create smtp_discard_ehlo_keyword_address_maps =
hash:/etc/postfix/mapname

>
> Easier to turn it off globally for a dedicated transport:
>
>     main.cf:
> # Use "cdb" if available
> default_database_type = hash
> indexed = ${default_database_type}:${config_directory}/
>
> disable_pipelining = PIPELINING, silent-discard
> transport_maps = ${indexed}transport
>
>     master.cf:
>     smtplite  unix  -       -       n       -       -       smtp
>  -o smtp_discard_ehlo_keywords=$disable_pipelining
>
>     transport:
>     example.com smtplite
>
>
> > And in the mapname file put:
> >
> > Client-domain.com pipelining
>
> No, this only works for IP addresses, but the transport based approach
> above works for domains.
>
> > I only see the 3 options of: pipelining, starttls, auth in the doc I
see,
> > should it bee nopipelining?
>
> No it should be "pipelining", because this is a *discard* keywords list.
>

To keep it simple I took out the pipelining statement as a quick test, and
that didn't work.
Is there something from the spamassassin/ anti-spam side that could be a
factor in this?
The exchange server has NOTHING for anti-spam, the postfix server acts as a
gateway to accomplish this.




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Re: mailq lockups

Victor Duchovni
On Thu, May 08, 2008 at 01:41:06PM -0400, Joey wrote:

> > No it should be "pipelining", because this is a *discard* keywords list.
>
> To keep it simple I took out the pipelining statement as a quick test, and
> that didn't work.

How did you do that? What evidence did you collect to check that PIPELINING
was not used?

> Is there something from the spamassassin/ anti-spam side that could be a
> factor in this?

How could this possibly matter? Postfix delivers mail long after all the
scanning is done. Delivery is just pumping bits out to the network.

> The exchange server has NOTHING for anti-spam, the postfix server acts as a
> gateway to accomplish this.

Don't make random guesses, measure! How's that "tcpdump" going???

--
        Viktor.

Disclaimer: off-list followups get on-list replies or get ignored.
Please do not ignore the "Reply-To" header.

To unsubscribe from the postfix-users list, visit
http://www.postfix.org/lists.html or click the link below:
<mailto:[hidden email]?body=unsubscribe%20postfix-users>

If my response solves your problem, the best way to thank me is to not
send an "it worked, thanks" follow-up. If you must respond, please put
"It worked, thanks" in the "Subject" so I can delete these quickly.
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RE: mailq lockups

MacShane, Tracy
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Victor Duchovni
> Sent: Friday, 9 May 2008 4:02 AM
> To: [hidden email]
> Subject: Re: mailq lockups
>
> On Thu, May 08, 2008 at 01:41:06PM -0400, Joey wrote:
>
> > > No it should be "pipelining", because this is a *discard* keywords
list.
> >
> > To keep it simple I took out the pipelining statement as a quick
test,
> > and that didn't work.
>
> How did you do that? What evidence did you collect to check
> that PIPELINING was not used?
>
> > Is there something from the spamassassin/ anti-spam side that could
be
> > a factor in this?
>
> How could this possibly matter? Postfix delivers mail long
> after all the scanning is done. Delivery is just pumping bits
> out to the network.
>
> > The exchange server has NOTHING for anti-spam, the postfix server
acts
> > as a gateway to accomplish this.
>
> Don't make random guesses, measure! How's that "tcpdump" going???
>
> --
> Viktor.


You can also measure on the Exchange side by examining the SMTP logs
(which you should have, despite the fact they're not enabled by default)
and also the Application event log on the Exchange server. You can also
increase the verbosity of the application logs on the Exchange server on
a per-service basis. This KB article gives some elementary steps:
http://support.microsoft.com/kb/257265 - you want to at least monitor
the Transport service (and log SMTP, as I mentioned).

Also, do you have Outlook installed on the Exchange server (which mucks
up MAPI) or the SMTP service enabled in IIS on an Ex2K7 transport
server? Both of those are no-nos.

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RE: mailq lockups

Joey-16
In reply to this post by Victor Duchovni
> -----Original Message-----
> From: [hidden email]
[mailto:[hidden email]]
> On Behalf Of Victor Duchovni
> Sent: Thursday, May 08, 2008 2:02 PM
> To: [hidden email]
> Subject: Re: mailq lockups
>
> On Thu, May 08, 2008 at 01:41:06PM -0400, Joey wrote:
>
> > > No it should be "pipelining", because this is a *discard* keywords
list.
> >
> > To keep it simple I took out the pipelining statement as a quick test,
and
> > that didn't work.
>
> How did you do that? What evidence did you collect to check that
PIPELINING
> was not used?

I disabled pipelining for everyone ran some test emails and it worked
exactly the same.


>
> > Is there something from the spamassassin/ anti-spam side that could be a
> > factor in this?
>
> How could this possibly matter? Postfix delivers mail long after all the
> scanning is done. Delivery is just pumping bits out to the network.
>

Based on what I see on the server, emails coming from email addresses that I
know are not valid, email which seems to lockup in the queue seems to be
what I would categorize as spam.

I did some additional tests this morning, and if I emailed directly from the
mailserver to the user on exchange there was no locked up connection on
either side.
Additionally if I sent from gmail to the user the message went right through
again with no lockup either on the postfix or exchange side.  

I don't want you to think that I am comfortable and have undisputed facts
here, but this is making more sense in respect to when it happens.

I downloaded and installed some tools for the tcpdump, but haven't had the
chance to play with all of it... I hope to soon.


I also seem to see several from specific domains that lock up, in doing a
whois I see privacy protection and then doing a dig with mx on the domain
look at this result:
flashcomicbooks.com.    7200    IN      MX      10
mx152.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx153.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx154.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx155.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx156.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx157.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx158.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx159.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx160.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx161.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx162.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx163.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx164.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx165.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx166.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx167.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx168.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx169.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx170.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx171.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx172.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx173.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx174.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx175.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx176.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx177.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx178.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx179.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx180.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx181.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx182.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx183.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx184.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx185.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx186.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx187.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx188.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx189.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx190.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx191.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx192.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx193.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx194.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx195.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx196.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx197.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx198.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx199.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx200.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx201.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx202.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx203.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx204.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx205.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx206.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx207.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx208.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx209.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx210.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx211.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx212.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx213.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx214.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx215.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx216.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx217.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx218.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx219.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx220.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx221.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx222.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx223.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx224.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx225.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx226.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx227.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx228.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx229.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx230.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx231.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx232.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx233.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx234.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx235.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx236.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx237.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx238.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx239.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx240.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx241.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx242.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx243.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx244.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx245.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx246.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx247.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx248.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx249.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx250.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx251.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx252.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx253.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx254.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx1.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx2.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx3.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx4.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx5.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx6.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx7.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx8.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx9.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx10.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx11.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx12.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx13.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx14.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx15.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx16.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx17.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx18.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx19.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx20.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx21.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx22.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx23.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx24.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx25.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx26.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx27.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx28.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx29.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx30.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx31.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx32.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx33.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx34.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx35.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx36.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx37.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx38.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx39.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx40.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx41.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx42.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx43.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx44.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx45.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx46.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx47.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx48.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx49.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx50.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx51.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx52.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx53.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx54.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx55.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx56.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx57.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx58.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx59.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx60.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx61.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx62.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx63.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx64.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx65.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx66.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx67.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx68.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx69.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx70.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx71.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx72.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx73.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx74.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx75.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx76.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx77.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx78.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx79.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx80.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx81.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx82.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx83.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx84.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx85.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx86.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx87.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx88.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx89.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx90.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx91.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx92.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx93.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx94.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx95.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx96.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx97.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx98.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10 mx99.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
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flashcomicbooks.com.    7200    IN      MX      10
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flashcomicbooks.com.    7200    IN      MX      10
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flashcomicbooks.com.    7200    IN      MX      10
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flashcomicbooks.com.    7200    IN      MX      10
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flashcomicbooks.com.    7200    IN      MX      10
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flashcomicbooks.com.    7200    IN      MX      10
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flashcomicbooks.com.    7200    IN      MX      10
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mx134.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx135.flashcomicbooks.com.
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mx136.flashcomicbooks.com.
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mx137.flashcomicbooks.com.
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mx138.flashcomicbooks.com.
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mx146.flashcomicbooks.com.
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mx147.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx148.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx149.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx150.flashcomicbooks.com.
flashcomicbooks.com.    7200    IN      MX      10
mx151.flashcomicbooks.com.

;; AUTHORITY SECTION:
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flashcomicbooks.com.    7200    IN      NS      ns1.flashcomicbooks.com.

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What legit business with exception of a big isp would have that many
mailservers.
Somehow there is something related to spam which is causing the lockup.
I have to play with the tcpdump stuff to try and figure out the next step...




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Re: mailq lockups

Wietse Venema
Joey:
> What legit business with exception of a big isp would have that many
> mailservers.
> Somehow there is something related to spam which is causing the lockup.

Stop speculating, start doing real measurements.

Send mail to the exchange box that pretends to come from such a domain.

    $ sendmail -f user@suspect-domain recipient... < inputfile

where inputfile contains some text.

And so on.

        Wietse
12