Antonin Verrier via Postfix-users:
> Le 21 octobre 2025 08:52:23 GMT+02:00, Antonin Verrier via Postfix-users
> <[email protected]> a ?crit?:
> >See this log line for example:
> >
> >2025-10-20T00:27:12.626227+02:00 mail postfix/mx/smtpd[226824]: warning:
> >Unable to look up MX host irondelle.o2switch.net for Sender address
> >[email protected]: Name or service not known
>
> I've just realized something... If I have the above line in my
> logs, doesn't that mean the A lookup for the MX is happening already
> anyway ?
>
> I have also check_sender_mx_access restriction in place so maybe it comes
> from there.
Like all check_*_access features, header_checks, body_checks, and
so on, the check_xxx_xx_access tables are searched only with
infformation that exists, not with its absence.
In your case, perhaps check_sender_mx_access could reject based on
the MX server name.
Wietse
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