Dnia 27.10.2023 o godz. 14:23:14 Marco M. via mailop pisze: > > You mean DMARC failure? > > > > SPF by itself checks only the envelope-From. > > If Sender: is missing, the application will most likely use From: for > envelope sender (MAIL FROM:) (normal MUAs do that). That will make SPF > fail and bounces will be send to the original sender of the message
It's not MUAs job to check SPF; it's MTAs job. "Normal" SPF checking happens at the connection phase, not at data phase, and is not interested at all in any headers of the message (neither From: nor Sender:). All it takes is the domain from MAIL FROM:. It's DMARC that requires alignment of MAIL FROM: domain with header From: domain, not SPF. -- Regards, Jaroslaw Rafa r...@rafa.eu.org -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub." _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
