Sender address rejected: Domain not found

[Ruben Safir Secretary NYLXS]

I'm sorry to bother everyone

Any clue why this is happening from the cointalk.com domain
I am locked out of the forum :)

2021-01-05T03:11:38.999012-05:00 www2 postfix/smtpd[26176]: NOQUEUE:
reject: RCPT from 23-111-188-110.static.hvvc.us[23.111.188.110]: 450
4.1.8 <[hidden email]>: Sender address rejected: Domain not
found; from=<[hidden email]> to=<[hidden email]>
proto=ESMTP helo=<server.cointalk.com>
www2:~ # grep cointalk /var/log/mail|less


www2:~ # dig mx [hidden email]

; <<>> DiG 9.9.2 <<>> mx [hidden email]
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58851
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;nginx\@server.cointalk.com.    IN      MX

;; AUTHORITY SECTION:
cointalk.com.           180     IN      SOA     ns0.dnsmadeeasy.com.
dns.dnsmadeeasy.com. 2008010139 43200 3600 1209600 180

;; Query time: 321 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Jan  5 03:18:18 2021
;; MSG SIZE  rcvd: 110


--
So many immigrant groups have swept through our town
that Brooklyn, like Atlantis, reaches mythological
proportions in the mind of the world - RI Safir 1998
http://www.mrbrklyn.com 

DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
http://www.nylxs.com - Leadership Development in Free Software
http://www2.mrbrklyn.com/resources - Unpublished Archive
http://www.coinhangout.com - coins!
http://www.brooklyn-living.com 

Being so tracked is for FARM ANIMALS and extermination camps,
but incompatible with living as a free human being. -RI Safir 2013

[ludicree]

Hi,

looks like a simple DNS error to me.

In order for mails from @server.cointalk.com to be valid, that domain must
exist as A records in DNS.

You could whitelist *.cointalk.com in postfix config, but I suggest fixing
the DNS.

Greets,
Ludi


-----Ursprüngliche Nachricht-----
Von: [hidden email] <[hidden email]> Im
Auftrag von Ruben Safir
Gesendet: Dienstag, 5. Januar 2021 09:19
An: [hidden email]
Betreff: Sender address rejected: Domain not found

I'm sorry to bother everyone

Any clue why this is happening from the cointalk.com domain I am locked out
of the forum :)

2021-01-05T03:11:38.999012-05:00 www2 postfix/smtpd[26176]: NOQUEUE:
reject: RCPT from 23-111-188-110.static.hvvc.us[23.111.188.110]: 450
4.1.8 <[hidden email]>: Sender address rejected: Domain not
found; from=<[hidden email]> to=<[hidden email]>
proto=ESMTP helo=<server.cointalk.com> www2:~ # grep cointalk
/var/log/mail|less


www2:~ # dig mx [hidden email]

; <<>> DiG 9.9.2 <<>> mx [hidden email] ;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58851 ;; flags: qr rd
ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;nginx\@server.cointalk.com.    IN      MX

;; AUTHORITY SECTION:
cointalk.com.           180     IN      SOA     ns0.dnsmadeeasy.com.
dns.dnsmadeeasy.com. 2008010139 43200 3600 1209600 180

;; Query time: 321 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Jan  5 03:18:18 2021
;; MSG SIZE  rcvd: 110


--
So many immigrant groups have swept through our town that Brooklyn, like
Atlantis, reaches mythological proportions in the mind of the world - RI
Safir 1998 http://www.mrbrklyn.com 

DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 http://www.nylxs.com
- Leadership Development in Free Software http://www2.mrbrklyn.com/resources
- Unpublished Archive http://www.coinhangout.com - coins!
http://www.brooklyn-living.com 

Being so tracked is for FARM ANIMALS and extermination camps, but
incompatible with living as a free human being. -RI Safir 2013

[Ansgar Wiechers]

On 2021-01-05 Ruben Safir wrote:

> Any clue why this is happening from the cointalk.com domain
> I am locked out of the forum :)
>
> 2021-01-05T03:11:38.999012-05:00 www2 postfix/smtpd[26176]: NOQUEUE:
> reject: RCPT from 23-111-188-110.static.hvvc.us[23.111.188.110]: 450
> 4.1.8 <[hidden email]>: Sender address rejected: Domain not
> found; from=<[hidden email]> to=<[hidden email]>
> proto=ESMTP helo=<server.cointalk.com>
> www2:~ # grep cointalk /var/log/mail|less
>
>
> www2:~ # dig mx [hidden email]
>
> ; <<>> DiG 9.9.2 <<>> mx [hidden email]
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58851
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
>
> ;; OPT PSEUDOSECTION:
> ; EDNS: version: 0, flags:; udp: 4096
> ;; QUESTION SECTION:
> ;nginx\@server.cointalk.com.    IN      MX

Your lookup is incorrect. The domain in question is server.cointalk.com,
not [hidden email]. The latter is the sender e-mail address
(localpart@domain).

The cause of the problem, however, is that there is no A record for
server.cointalk.com:

me@localhost:~ $ host server.cointalk.com
Host server.cointalk.com not found: 3(NXDOMAIN)

Postfix rejects the mail because it cannot resolve the sender domain.

Regards
Ansgar Wiechers
--
"Abstractions save us time working, but they don't save us time learning."
--Joel Spolsky

[Wietse Venema]

Ruben Safir:

> I'm sorry to bother everyone
>
> Any clue why this is happening from the cointalk.com domain
> I am locked out of the forum :)
>
> 2021-01-05T03:11:38.999012-05:00 www2 postfix/smtpd[26176]: NOQUEUE:
> reject: RCPT from 23-111-188-110.static.hvvc.us[23.111.188.110]: 450
> 4.1.8 <[hidden email]>: Sender address rejected: Domain not
> found; from=<[hidden email]> to=<[hidden email]>
> proto=ESMTP helo=<server.cointalk.com>
> www2:~ # grep cointalk /var/log/mail|less
>
>
> www2:~ # dig mx [hidden email]

$ dig mx server.cointalk.com

; <<>> DiG 9.11.25-RedHat-9.11.25-2.fc32 <<>> mx server.cointalk.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 25012
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

        Wietse

[Ruben Safir Secretary NYLXS]

On Tue, Jan 05, 2021 at 10:02:08AM +0100, Ansgar Wiechers wrote:

> On 2021-01-05 Ruben Safir wrote:
> > Any clue why this is happening from the cointalk.com domain
> > I am locked out of the forum :)
> >
> > 2021-01-05T03:11:38.999012-05:00 www2 postfix/smtpd[26176]: NOQUEUE:
> > reject: RCPT from 23-111-188-110.static.hvvc.us[23.111.188.110]: 450
> > 4.1.8 <[hidden email]>: Sender address rejected: Domain not
> > found; from=<[hidden email]> to=<[hidden email]>
> > proto=ESMTP helo=<server.cointalk.com>
> > www2:~ # grep cointalk /var/log/mail|less
> >
> >
> > www2:~ # dig mx [hidden email]
> >
> > ; <<>> DiG 9.9.2 <<>> mx [hidden email]
> > ;; global options: +cmd
> > ;; Got answer:
> > ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 58851
> > ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
> >
> > ;; OPT PSEUDOSECTION:
> > ; EDNS: version: 0, flags:; udp: 4096
> > ;; QUESTION SECTION:
> > ;nginx\@server.cointalk.com.    IN      MX
>
> Your lookup is incorrect. The domain in question is server.cointalk.com,
> not [hidden email]. The latter is the sender e-mail address
> (localpart@domain).
>
> The cause of the problem, however, is that there is no A record for
> server.cointalk.com:
>
> me@localhost:~ $ host server.cointalk.com
> Host server.cointalk.com not found: 3(NXDOMAIN)
>
> Postfix rejects the mail because it cannot resolve the sender domain.

Thanks!  I don't run cointalk.com  But I will pass this info on


>
> Regards
> Ansgar Wiechers
> --
> "Abstractions save us time working, but they don't save us time learning."
> --Joel Spolsky

--
So many immigrant groups have swept through our town
that Brooklyn, like Atlantis, reaches mythological
proportions in the mind of the world - RI Safir 1998
http://www.mrbrklyn.com 

DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
http://www.nylxs.com - Leadership Development in Free Software
http://www2.mrbrklyn.com/resources - Unpublished Archive
http://www.coinhangout.com - coins!
http://www.brooklyn-living.com 

Being so tracked is for FARM ANIMALS and extermination camps,
but incompatible with living as a free human being. -RI Safir 2013

[Wietse Venema]

Ruben Safir:
> > me@localhost:~ $ host server.cointalk.com
> > Host server.cointalk.com not found: 3(NXDOMAIN)
> >
> > Postfix rejects the mail because it cannot resolve the sender domain.
>
> Thanks!  I don't run cointalk.com  But I will pass this info on

They probably should be sending mail as [hidden email],
instead of using the name of an internal machine that isn't reachable
from other networks.

        Wietse