[Mailman-Users] DMARC and Gmail

Joseph Brennan brennan at columbia.edu
Wed Apr 16 19:35:37 CEST 2014

[DMARC's words]
>    o  A "silent discard", wherein the SMTP server returns a 2xy reply
>       code implying to the client that delivery (or, at least, relay)
>       was successfully completed, but then simply discarding the
>       message with no further action.

Naturally the people who can't read RFC5322 and understand that the From 
header line represents the writer of the message also can't read RFC5321 
and grasp that a 2xy code signifies a responsibility that is well defined 
(sec 4.2.5).

They're just making stuff up.  And companies that fall for it betray their 

Joseph Brennan
Columbia University Information Technology

(N.B. They were so proud of using "wherein" that they got lost later in the 
sentence-- s/b "discards" not "discarding".)

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