We found the following in our email log: May 26 00:35:57 mail01.raystedman.org postfix/t124/smtp[39065]: 0A7D630F1C7C: to=<es-devo-bounce+<deleted>= cecytebc.edu...@devotion.raystedman.org>, relay=aspmx.l.google.com[142.251.2.26]:25, delay=0.52, delays=0/0/0.21/0.31, dsn=5.7.26, status=bounced (host aspmx.l.google.com[142.251.2.26] said: 550-5.7.26 Unauthenticated email from raystedman.org is not accepted due to 550-5.7.26 domain's DMARC policy. Please contact the administrator of 550-5.7.26 raystedman.org domain if this was a legitimate mail. To learn about 550-5.7.26 the DMARC initiative, go to 550 5.7.26 https://support.google.com/mail/?p=DmarcRejection 98e67ed59e1d1-2bf5fe61ba7si4174351a91.147 - gsmtp (in reply to end of DATA command))
We delivered 1000s of email to Google in this time frame -- we received only five failures like the one above. I worked with the Google Team today and determined the following: (1) Our SPF DNS contains the IP Address this email was sent from. This implies DMARC should have passed -- as I believe DMARC requires failures for Both SPF and DKIM for a hard failure. (2) The sending IP Address is a valid relay for our domain at Google. The email should not have been Unauthenticated as a result. (3) I checked bou...@raystedman.org which in general ends up with all email that bounce and contains VERP -- this was not the case with this email. The Google Team would like to have the message headers of this email to further debug the issue. How can I use Postfix to capture the email headers/content in this case. Thanks, Greg
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