Am 27.10.2023 um 16:00:26 Uhr schrieb Jaroslaw Rafa via mailop: > 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.
I didn't write that MUAs do SPF checking. > "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:. Entirely true, but Sender: has impact on the value of MAIL FROM: for some programs. Our Listserv for example has. But it depends on the application. If the mailing list system sets the MAIL FROM address to the list-boun...@lists.example.org address, everything is fine for SPF, regardless of From: or Sender:. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
