postscreen: 550 5.5.1 Protocol error

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postscreen: 550 5.5.1 Protocol error

Jeetu-5
Hi,

Im using postfix 2.8.5 with postscreen.
Im constantly getting this error message

Oct 18 08:02:10 inbound-us1 postfix/postscreen[12189]: NOQUEUE: reject:
RCPT from [x.x.x.x]:64730: 550 5.5.1 Protocol error;
from=<[hidden email]>, to=<[hidden email]>, proto=SMTP,
helo=<greetings.info>
Oct 18 08:02:14 inbound-us1 postfix/postscreen[12189]: NOQUEUE: reject:
RCPT from [x.x.x.x]:65127: 550 5.5.1 Protocol error;
from=<[hidden email]>, to=<[hidden email]>, proto=SMTP,
helo=<greetings.info>
Oct 18 08:02:27 inbound-us1 postfix/postscreen[12189]: NOQUEUE: reject:
RCPT from [x.x.x.x]:26330: 550 5.5.1 Protocol error;
from=<[hidden email]>, to=<[hidden email]>, proto=SMTP,
helo=<zoomz.info>
Oct 18 08:02:27 inbound-us1 postfix/postscreen[12189]: NOQUEUE: reject:
RCPT from [x.x.x.x]:21985: 550 5.5.1 Protocol error;
from=<[hidden email]>, to=<[hidden email]>, proto=SMTP,
helo=<zoomz.info>

Can someone explain me whats wrong in my postscreen configuration ?

My postconf is
...
postscreen_access_list = permit_mynetworks,        
hash:/etc/postfix/clients_access-postscreen
postscreen_blacklist_action = enforce
postscreen_client_connection_count_limit = 100
postscreen_dnsbl_action = enforce
postscreen_dnsbl_reply_map = texthash:/etc/postfix/dnsbl_reply
postscreen_dnsbl_sites = zen.mail.com
postscreen_greet_action = enforce
postscreen_helo_required = $smtpd_helo_required
postscreen_reject_footer = $smtpd_reject_footer
...

--
-Jeetu

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Re: postscreen: 550 5.5.1 Protocol error

Ralf Hildebrandt
* Jeetu <[hidden email]>:

> Hi,
>
> Im using postfix 2.8.5 with postscreen.
> Im constantly getting this error message
>
> Oct 18 08:02:10 inbound-us1 postfix/postscreen[12189]: NOQUEUE:
> reject: RCPT from [x.x.x.x]:64730: 550 5.5.1 Protocol error;
> from=<[hidden email]>, to=<[hidden email]>,
> proto=SMTP, helo=<greetings.info>
> Oct 18 08:02:14 inbound-us1 postfix/postscreen[12189]: NOQUEUE:
> reject: RCPT from [x.x.x.x]:65127: 550 5.5.1 Protocol error;
> from=<[hidden email]>, to=<[hidden email]>, proto=SMTP,
> helo=<greetings.info>
> Oct 18 08:02:27 inbound-us1 postfix/postscreen[12189]: NOQUEUE:
> reject: RCPT from [x.x.x.x]:26330: 550 5.5.1 Protocol error;
> from=<[hidden email]>, to=<[hidden email]>, proto=SMTP,
> helo=<zoomz.info>
> Oct 18 08:02:27 inbound-us1 postfix/postscreen[12189]: NOQUEUE:
> reject: RCPT from [x.x.x.x]:21985: 550 5.5.1 Protocol error;
> from=<[hidden email]>, to=<[hidden email]>, proto=SMTP,
> helo=<zoomz.info>
>
> Can someone explain me whats wrong in my postscreen configuration ?

Nothing. The sending client doesn't properly speak SMTP.

--
Ralf Hildebrandt
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Re: postscreen: 550 5.5.1 Protocol error

Wietse Venema
In reply to this post by Jeetu-5
Jeetu:
> Hi,
>
> Im using postfix 2.8.5 with postscreen.
> Im constantly getting this error message
>
> Oct 18 08:02:10 inbound-us1 postfix/postscreen[12189]: NOQUEUE: reject:
> RCPT from [x.x.x.x]:64730: 550 5.5.1 Protocol error;
> from=<[hidden email]>, to=<[hidden email]>, proto=SMTP,
> helo=<greetings.info>

The mail client makes errors in the SMTP protocol.

Grep the logfile for the client IP address, and it will show you
what kind of protocol error the client was making.

        Wietse