MESSAGE
| DATE | 2021-01-05 |
| FROM | Karl Auer
|
| SUBJECT | Re: [Hangout - NYLXS] Sender address rejected: Domain not found
|
On Tue, 2021-01-05 at 03:19 -0500, Ruben Safir wrote:
> 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 : Sender address rejected: Domain
> not found; from= to=> > proto=ESMTP helo=
>
Hmm. Possibly because the domain "server.cointalk.com" does not exist?
kauer-at-kt1:~$ dig +short server.cointalk.com
[nothing]
kauer-at-kt1:~$ dig +short server.cointalk.com mx
[nothing]
BUT
kauer-at-kt1:~$ dig +short cointalk.com
23.111.188.110
kauer-at-kt1:~$ dig +short cointalk.com mx
20 mx2.zohomail.com.
10 mx.zohomail.com.
When using dig, leave non-domain information out. So look up
"server.cointalk.com", not "nginx-at-server.cointalk.com".
Looks to me as if the server sending the email needs to use the right
sender domain, OR the mail server it is sending through needs to
rewrite the sender domain. Probably to "cointalk.com". If the sender
cannot receive responses by email, it should probably fake a sender
address like "no-reply-at-cointalk.com".
Regards, K.
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer-at-biplane.com.au)
http://www.biplane.com.au/kauer
GPG fingerprint: 2561 E9EC D868 E73C 8AF1 49CF EE50 4B1D CCA1 5170
Old fingerprint: 8D08 9CAA 649A AFEF E862 062A 2E97 42D4 A2A0 616D
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