On Tue, Jul 09, 2024 at 06:17:26PM +0100, Gilgongo wrote:
> > > My first thought was to start by firewalling off mail ports on the local
> > > machine to only allow processes owned by root or postfix.
> >
> > Why? Just inspect the messages they submit, SASL is not required.
>
> Apologies - perhaps I've misunderstood, but if I use (for example)
> mail.mailutils to send to u...@yahoo.com from m...@mydomain.com then I
> see the client communicate directly with the MX of yahoo.com over port
> 25. I'd like it to communicate with my mail server instead.
When you say "the client", what do you mean? Do applications do "direct
to MX" mail transmission? That seems odd, because they generally lack
the capability to queue and retry messages if there's a temporary error.
Is "the client" Postfix, or really some application?
--
Viktor.
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