We've seen the below failure for two different clients (each in one specific campaign) which resulted in lots of these failures at Gmail for those respective campaigns. Our Support/Ops team continue to insist that we sent these campaigns with the same exact from address/header/domain set up as all of the other campaigns launched on this day and that the issue must be on Gmail's side. I'm praying that somebody here has had experience with this failure and tracked down some subtle/quirky reason why an otherwise reliable sending MTA would encounter this failure?
Best, John 550-5.7.1 [142.54.247.27] Our system has detected that this message is not RFC\r\n550-5.7.1 5322 compliant:\r\n550-5.7.1 'From' header is missing.\r\n550-5.7.1 To reduce the amount of spam sent to Gmail, this message has been\r\n550-5.7.1 blocked. Please visit\r\n550-5.7.1 https://support.google.com/mail/?p=RfcMessageNonCompliant\r\n550 5.7.1 and review RFC 5322 specifications for more information.
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