Peter via Postfix-users skrev den 2024-06-21 08:45:
On 21/06/24 07:13, Wietse Venema via Postfix-users wrote:
SPF/DKIM/DMARC Checklist for (IMO) the best chance of getting your mail
to be accepted:
1. HELO banner should pass SPF.
2. Envelope Sender should pass SPF.
3. Envelope Sender domain should align with the From: header domain.
4. Message should be DKIM signed.
5. Domain for the DKIM signature should align with the From: header
domain.
Not all of the able are necessary (e.g. you can get away with SPF
alignment only or DKIM alignment only) but the more of those boxes that
you can successfully tick off the better chance you have for you
message to be accepted when things go wrong, or when a destination
doesn't implement one of the above checks properly.
3 would not be posssible when recipient forwards to another mta, basicly
why maillist all breaks dkim, some says spf breaks mailforwards, nothing
could be more fails, since nexthop gives new envelope sender, with will
not align with header from:
stop breaking dkim, let maillist be unaligned, and direct mail be
aligned pass
sadly maybe sys4.de knows better, but cloud9 was perfect not breaking
dkim
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