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From: Nick Dokos <ndokos@gmail.com>
Newsgroups: gmane.emacs.help
Subject: Re: Newbie with Gnus and posteo email setup
Date: Fri, 24 May 2019 10:29:36 -0400
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Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> Ha, I forgot the other half! Thanks. FWIW, I use msmtp.
>
>> I run postfix on my machines and use smtpmail.el:
>
> Possibly dumb question, but doesn't this mean outgoing mail leaves your
> machine on port 25? I thought most ISPs blocked that port.
>

No, postfix on my localhost listens on port 25, but it forwards the mail
according to the spec in /etc/postfix/main.cf. That can specify whatever
port the relay server is listening on.

-- 
Nick

"There are only two hard problems in computer science: cache
invalidation, naming things, and off-by-one errors." -Martin Fowler