MESSAGE
| DATE | 2021-01-05 |
| FROM | Ansgar Wiechers
|
| SUBJECT | Re: [Hangout - NYLXS] Sender address rejected: Domain not found
|
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 : Sender address rejected: Domain not
> found; from= to=
> proto=ESMTP helo=
> www2:~ # grep cointalk /var/log/mail|less
>
>
> www2:~ # dig mx nginx-at-server.cointalk.com
>
> ; <<>> DiG 9.9.2 <<>> mx nginx-at-server.cointalk.com
> ;; 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\-at-server.cointalk.com. IN MX
Your lookup is incorrect. The domain in question is server.cointalk.com,
not nginx-at-server.cointalk.com. The latter is the sender e-mail address
(localpart-at-domain).
The cause of the problem, however, is that there is no A record for
server.cointalk.com:
me-at-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
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