Postfix HELP!!

From	Lars Poulsen <lars@beagle-ears.com>
Newsgroups	alt.unix.geeks, comp.os.linux.misc
Subject	Postfix HELP!!
Followup-To	alt.unix.geeks
Date	2026-02-26 00:36 +0000
Organization	A noiseless patient Spider
Message-ID	<slrn10pv5cg.2afs7.lars@cleo.beagle-ears.com> (permalink)

Cross-posted to 2 groups.

Followups directed to: alt.unix.geeks

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When I started to rebuild my home server somplex, which involves a mail
server, people here suggested that it would be simpler to scrap my 15
year old sendmail setup and switch to postfix, rather than to figure out
where things were breaking.

Indeed, it was very easy to get it set up where I can RECEIVE email,
but I cannot SEND email (except for some very limited circumstances).

IMAP (with STARTTLS link encryption) works flawlessly.
Incoming email from strangers works very good as well.

But when my Windows PC that sits on the same LAN tries to submit
outgoing mail messages, they fail to go out. It appears that
postfix considers them prohibited relaying, even though they are
addressed to my own mailbox on my own local mail server.

Strangers like customers of Gmail can send me email to that same
mailbox. But if my desktop at work tries to send a message "From"
my own email address, it never reaches the postfix incoming server
through the NAT server. The attempted connection never hits
/var/log/maillog. But if I - from that same outside PC - send it
using my company email address (which is hosted on RackSpace) it gets
delivered cleanly.

How do I turn on some logging that for example can tell me which local
TCP port (25, 587, 465, 2525) and which encryption overlay (if any)
is used for them to login? I think I only have 25 and 587 enabled.

I am stumped.

-- 
Lars Poulsen - an old geek in Santa Barbara, California

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Thread

Postfix HELP!! Lars Poulsen <lars@beagle-ears.com> - 2026-02-26 00:36 +0000
  Re: Postfix HELP!! Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-02-26 05:00 +0000
    Re: Postfix HELP!! - Thanks! Lars Poulsen <lars@beagle-ears.com> - 2026-02-26 13:49 +0000
      Re: Postfix HELP!! - Thanks! Rich <rich@example.invalid> - 2026-02-26 16:02 +0000
        Re: Postfix HELP!! - Thanks! Lars Poulsen <lars@beagle-ears.com> - 2026-02-26 18:09 +0000
          Re: Postfix HELP!! - Thanks! Rich <rich@example.invalid> - 2026-02-27 00:29 +0000
      Re: Postfix - Next: Google Postmaster Tools Lars Poulsen <lars@beagle-ears.com> - 2026-02-26 18:54 +0000
        Re: Postfix - Next: Google Postmaster Tools not@telling.you.invalid (Computer Nerd Kev) - 2026-02-27 06:49 +1000
        Re: Postfix - Next: Google Postmaster Tools Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-02-27 00:23 +0000
        Re: Postfix - Next: Google Postmaster Tools Stéphane CARPENTIER <sc@fiat-linux.fr> - 2026-02-28 12:13 +0000

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