On Wed, Apr 16, 2014 at 11:00:31AM +1200, Brian E Carpenter wrote: > > > (If the originating domain is expressly *not* OK with the > > redistribution, the mailing list should bounce the message back to the > > author saying as much.) > > Isn't that exactly what p=reject implies? If so, the logical behaviour > for all list software would be to check the DMARC record for the > originating domain of each message, and bounce it if p=reject. The question is which is more or less unfriendly? 1) Forbidding yahoo.com users from participating on mailing lists 2) Rewriting the from field of yahoo.com users. I could easily see the mailing list software making this be configurable, so it's up to each mailing list admin. :-) - Ted P.S. #1 could also be combined with a nice message inviting the yahoo.com user to find another e-mail provider.