David B Funk skrev den 2015-10-06 22:33:
So that explicit forward breaks the SPF chain, thus triggering that SPF fail.The valid DKIM signature indicates that the message is legit.
its a brain dead forwarder that use the From: header so, if it used the envelope sender it would not break spf, forwarding hosts must use there own domain as envelope sender, if thay think we just use From: header it breaks spf
possible that same reason Sender-ID is dropped, and DKIM is now invented to replace it
