Christian H. Kuhn via Postfix-users:
> from mailout1-87.xing.com[109.233.158.87]
> 2025-05-28T19:05:24.783884+02:00 bywater postfix/smtpd[1610483]:
> NOQUEUE: reject: RCPT from mailout1-87.xing.com[109.233
> .158.87]: 451 4.3.0 <j...@mail.xing.com>: Temporary lookup failure;
> from=<j...@mail.xing.com> to=<qno-x...@qno.de> proto
> =ESMTP helo=<mailout1-87.xing.com>
(There should be warnings logged that saywhich table lookup failed.
Does your system perhaps log error and non-error messages to different
files? That is not a good idea - it complicates trouble shooting.)
The Postfix SMTP daemon logs "451 4.3.0 <sender>: Temporary lookup failure"
after "smtpd_sender_restrictions = reject_unknown_sender_domain"
fails with a table lookup error.
- First the Postfix SMTP daemon asks the trivial-rewrite daemon to
figure out what the destination domain is. In this process the
trivial-rewrite daemon seaches domain lists such as mydestination
and virtual_alias_domains. If those lookups experience an error,
then the Postfix SMTP daemon logs the above error message.
- Next the Postfix SMTP daemon is supposed to find out if the domain
exists in DNS, but there are no table lookups involved here.
My bet is that the above error goes away when you delete
smtpd_sender_restrictions.
The error may then happen at a different point in time, while
processing smtpd_recipient_restrictions.
BTW you need to request a new Zen API key and delete the old one.
Wietse
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