On Aug 9, 2013, at 9:11 PM, Tim Draegen <[email protected]<mailto:[email protected]>> wrote:
Franck Martin was running this down most recently, based on some chatter on the mailman-dev list. I'll offer up Franck's thinking (of which I agree!): - Register 5.7.17 with IANA - http://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xml - ..to indicate a DMARC policy rejection. Unclear if such an entry would cover SPF, ADSP, etc, too. I think 5.7.17 should be a bit generic to indicate the email could not be (domain?) authenticated, be it with SPF, ADSP, DMARC, and even TLS. However it should not indicate a SMTP AUTH failure. We should take this discussion over to [email protected]<mailto:[email protected]>
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