Alex via Postfix-users:
> Hi,
> I have a fedora40 system with postfix-3.8.5 and would like to configure
> header checks depending on the domain. Perhaps there is some kind of
> conditional that can be used based on the sending domain?
>
> For example:
>
> if recip-domain == example.com
> /^From: u...@baddom.tld/ REJECT spam
> fi
For multi-criteria rules use an smtpd_milters milter-regex plugin.
Example:
/etc/postfix/main.cf:
smtpd_milters = inet:127.0.0.1:9999
/etc/mail/milter-regex.conf:
reject
header /From/ /^user@baddom\.tld$/i and envrcpt /@example\.com$/i
Specify the "i" flag to make the pattern case-insensitive, and
specify the "e" flag to enable "extended" POSIX syntax (enable
"(" and ")" for grouping, "|" for alternatives, and "+" for
one-or-more).
[Plus some systemd or rc file syntax for milter-regex start-up]
Wietse
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