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From: Knute Johnson <knute2024@585ranch.com>
Newsgroups: comp.mail.sendmail
Subject: Re: Forwarding problem with aliases
Date: Thu, 5 Sep 2024 17:22:29 -0500
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On 9/5/24 16:10, Marco Moock wrote:
> 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.
> 

Thanks for that.  What is ARC?

-- 

Knute Johnson