Ian Eiloart:
Unless the intermediary co-operates by re-signing, mailing lists can break
DKIM signatures. Since mailing lists generally use their own rfc5321 return
paths, SPF failures should not result. Of course, a broken DKIM signature
is equivalent to none at all. You should not reject or discard mail on this
basis, but you do lose the ability to assign signer domain based reputation
to the message.
Unless the intermediary co-operates with SRS, or similar, *forwarding* can
result in SPF failure. Since forwarders generally don't change the message
content, DKIM signatures should remain intact.
Please do not confuse mailing lists with email forwarding. The two
are different things. It is not helpful to take an argument from
one context and use that to "prove" a point in the other context.
Wietse
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