Viktor Dukhovni via Postfix-users:
> On Wed, Sep 16, 2026 at 05:08:16AM +0100, Howard Chu via Postfix-users wrote:
>
> > I'd like a check for a specific recipient address, that only accepts mail
> > if the envelope recipient
> > matches the To header, and I want it before queueing so that failed matches
> > can return an immediate 550,
> > instead of trying to generate a bounce message.
> >
> > The use case: I have a mailman list owner on a remote site,
> > [email protected] which is configured
> > to send to an alias on my own site [email protected].
> > [email protected] is now receiving spam
> > with To: headers that include random, garbage email addresses.
> >
> > Legitimate emails to [email protected] will only contain
> > [email protected] in the To: header.
> >
> > It seems like the only way to get what I want is by writing a milter, but I
> > wanted to double-check here if
> > anyone else has any ready-made solutions for this?
>
> Your choices are either a milter (the Python milter frameworks are
> generally user-friendly) or an SMTP proxy filter.
Perhaps a milter-regex rule can handle this?
Wietse
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