On Thu, Dec 01, 2022 at 10:02:02AM +0100, linux...@gmx.net wrote:
> I am using postfix as mail relay which is deployed on gateway for
> internal users. This relay send mail out only, doesn't accept
> messages. My question is, do I need to make the relay server port 25
> listened on 0.0.0.0? or just 127.0.0.1 should work?
It needs to listen on the IP address and port combinations that the
internal "users" will establish TCP connections to (if that's what they
are doing).
Are these "submission" users sending mail via some MUA (Thunderbird,
Mail.app, Outlook, Mutt, ...) or client "hosts" running MTAs that
forward messages via SMTP for external recipient to your "relay", or is
the mail generated locally on the machine?
--
Viktor.
