On Fri, 27 Mar 2026 01:55:38 +1100
Viktor Dukhovni via Postfix-users <[email protected]> wrote:
[snip]
> The simplest thing is often to just block
> port 25 messages with an envelope sender in your domains, the SASL
> does not actually come into it.
>
> smtpd_sender_restrictions =
> check_sender_access inline:{
> { example.com = reject },
> { example.net = reject },
> { example.org = reject }
> }
>
> Applies equally to all clients, whether MTAs or MUAs.
You write "block port 25 messages," but does the above rule not apply
to *all* incoming connections, incl. submission and smtps (587 and
465, respectively)?
Regards,
Jim
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