On Mon, Jul 29, 2024 at 09:40:45AM +0200, Ralf Hildebrandt via Postfix-users
wrote:
> * Viktor Dukhovni via Postfix-users <postfix-users@postfix.org>:
>
> > > Is this intentional or a side-effect?
> >
> > I'm guessing you have "smtpd_reject_unlisted_sender = yes"?
>
> Yes.
>
> > In that case, this'd be expected.
>
> OK! I was just wondering if I missed a reference somewhere in the
> docs, since I didn't really see this being mentioned in transport(5)
Well, this isn't really about transport(5), but rather about the sender
resolving somehow to the "error" transport, which can also, e.g., happen
for unmatched localparts in virtual alias domains. An address that
resolves to the error transport, and is not rewritten by virtual
aliases, or similar,is presumptively invalid (unlisted).
--
Viktor.
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