On Jun 3, 2014, at 8:44 PM, John Levine <jo...@taugh.com> wrote: >> Yes the email is legitimate, but how does the MTA knows it? >> >> Well a bayesian filter has learned that this type of content is legitimate, >> and then one day a spammer >> uses the same content, but change one link... > > That could happen to any mail feature you care to name. > > Big companies send buckets of mail with return addresses like > "donotrespond". A non-deliverable or non-replyable From: line has > never had much connection to whether to deliver the mail.
I agree that From addresses such as these will suffer no adverse deliverability issues: nore...@github.com, donotre...@etrade.com But that is not equivalent to putting non-resolvable gibberish on the right side of the @ sign. That's a reliable way of assuring that such messages do not get queued on my server. As a matter of practicality, I highly doubt that I'm unique in requiring that the sender domain (envelope and header) resolve. Matt _______________________________________________ dmarc mailing list dmarc@ietf.org https://www.ietf.org/mailman/listinfo/dmarc
