LKML: Dropped mail fanout?

[Valdis.Kletnieks at vt.edu]

On Wed, 07 May 2014 14:19:20 -0700, David Matlack said:

> gmail.com implements DMARC on the receive end. The idea being, gmail sees that
> Sender != From, and silently drops the message (theoretically).

For those playing along at home who don't wear e-mail admin hats, the problem
is that several 800 pound gorillas have deployed DMARC tags that basically
say "If this mail didn't come from us, feel free to toss it out".

Unfortunately, if somebody posts mail from one of these gorilla companies to
a mailing list, it gets to list recpients tagged "sender = mailinglist", which
doesn't match the From.  So if the recipients are on mail services that check
DMARC at the receipt end, their mail server will reject the mail.

And then hilarity ensues. :)
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