Hi all, In the process of changing ESPs, we have turned off some ancillary headers until the new backend code supported them. The headers we used (among others) included: list-id (requested by yandex.ru postoffice console, auto-submitted (suggested on this list to quiesce automatic responses), X-Postmaster-Msgtype (requested by mail.ru postmaster console), list-unsubscribe (recommended by gmail best practices) and X-Auto-Response-Suppress (alternative standard for MS systems and clients to quiesce automatic responses)
the moment these have been re-instated, google started throwing (at least part) of our emails visibly in MTA logs: 550 5.7.1 [XX.XX.XX.XX 12] Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. Please visit http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for more information. this is baffling. has anyone else ever encountered this situation? why would adding any of these have such a dramatic impact on whether a given e-mail is spam or not? Regards, Gil Bahat, DevOps/Postmaster, Magisto Ltd.
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