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From: om@iki.fi (Otto J. Makela)
Newsgroups: comp.mail.sendmail
Subject: Re: Sendmail and DKIM for bounce messages?
Date: Wed, 19 Mar 2025 15:31:10 +0200
Organization: Games and Theory
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om@iki.fi (Otto J. Makela) wrote:

> I've even considered hard-wiring these mail recepients to only use
> IPv4, but of course doing this is painful since M365 keeps shifting
> around so much.

I actually just did this, inserted into mailertable a line like

	client.domain	esmtp:[ipv4-address-of-their-m365-mx]

and then ran

	/usr/lib/sendmail -qRclient.domain

which nicely transferred the outstanding queue of messages from
mailer-daemon to their server. "Of course" they'll accept unsigned
messages if you are connecting over IPv4 :-/

Unfortunately, this horrible kludge is not something one really can
leave in place for an extended period.
-- 
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