On 2023-03-23 at 16:18:24 UTC-0400 (Thu, 23 Mar 2023 15:18:24 -0500) Jarland Donnell via mailop <jarl...@mxroute.com> is rumored to have said:
I'd like to add a +1 to this for clarification, but in my case I'm focused solely on SRS. Will Hotmail reject DMARC failures based on From headers or envelope senders?
DMARC does not refer to envelope senders. SPF operates on the envelope sender, but unless the From header address is aligned with the envelope sender domain, SPF is not relevant to DMARC. DKIM also must align with the From header, for it to be relevant to DMARC.
I mean, Gmail already rejects a lot of DMARC failures based on From headers (I assume, since rewriting envelope sender doesn't seem to consistently change the result), so there's plenty of precedent for it and most people aren't really going to blame anyone for doing what Gmail does. But it sure is nice if our users can see the same behavior when forwarding as they have until now.
I would not interpret a rejection as being due to DMARC unless the error message specifically cited it and the From header address has a p=reject DMARC record. However, if the From header address domain does have p=reject and you're forwarding the message, nothing you do to the envelope sender can (or should) save it.
-- Bill Cole b...@scconsult.com or billc...@apache.org (AKA @grumpybozo and many *@billmail.scconsult.com addresses) Not Currently Available For Hire _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
