Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Marco Moock <mm+usenet-es@dorfdsl.de>
Newsgroups: comp.mail.sendmail
Subject: Re: Forwarding problem with aliases
Date: Thu, 5 Sep 2024 23:10:27 +0200
Organization: A noiseless patient Spider
Lines: 28
Message-ID: <vbd6o4$ffnj$2@dont-email.me>
References: <vbab8d$3uj4b$1@dont-email.me>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Injection-Date: Thu, 05 Sep 2024 23:10:28 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="7bd0e5b6527dc26f3942b04b8d62242e";
	logging-data="507635"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX18QgQsFfjO8d85bPYLncuOA"
Cancel-Lock: sha1:nLKMdDC6WJ9lk23y5N9uE7ylBis=
Bytes: 2036

On 04.09.2024 um 14:09 Uhr Knute Johnson wrote:

> I've got a sendmail server running that needs to forward a couple of 
> addresses to other destinations.  I've set these up in aliases.  Most
> of these work but one recipient has an earthlink account and it
> rejects the forwarded message if the sender is not local to the
> sendmail server. The error message in the returned mail says "The
> sender's address is rejected for policy reasons."  Kind of cryptic.
> The end user whitelisted the server's domain but I don't think that
> is where the issue is.  I think it is because the sender could be
> from anywhere and that doesn't match the domain of our sendmail
> server.  But that is just a guess.  If I send mail from an account on
> the server to the one of the forwarding aliases, it forwards to the
> earthlink account just fine.

If you forward messages, SPF will break. Many sites reject such
messages.
If you now rewrite the MAIL FROM, SPF will be fine but DMARC will fail
if a reject policy is set.

You may need to think about implementing ARC with a Milter.

-- 
kind regards
Marco

Send spam to 1725451741muell@cartoonies.org