lestraw:
> Hi postfix familiy,
>
> I'm using thunderbird as a email client, and when sending an email is giving
> me the following error on /var/log/maillog:
>
> Mar 18 19:54:39 server postfix/smtpd[21712]: NOQUEUE: reject: RCPT from
> unknown[DDD.D.DDD.DDD]: 451 4.3.5 Server configuration error;
> from=<aaa...@aaaaaaaaa.com> to=<aaaa...@aaaaa.com> proto=ESMTP
> helo=<[DD.D.D.DD]>
That text is sent to the remote client, and therefore it has no
configuration details.
Instead, Postfix logs internal details BEFORE replying to the client.
Wietse
