Thank you all. About Laura's question, I can confirm that on our end, we successfully forwarded the message with a 2XX response from Google within a few seconds. Our timestamp show that this user should have received the email 8 hours before he really received it.
@Alexander: Your suggestion is very interesting! We recently started implementing MTA-STS so it's highly possible that we messed something up in that regard. I'll take a close look tomorrow about it. If I find anything, I'll keep this thread updated. If any of you have any suggestions, I'm all ears! Thank you for your help!! Le mer. 20 avr. 2022 à 15:39, Alexander Huynh via mailop <mailop@mailop.org> a écrit : > On 2022-04-20 12:51:47 +0200, Cyril - ImprovMX wrote: > > What happened here ? > > Anecdotally, I recently switched MX servers and found that my emails > from Google were also delayed for about 8 hours. The next day when I > received my MTA-STS reports, I found 53 failures as reported by Google, > since my then MTA-STS policy did not include the new MX server. While I > can't say your issue is due to MTA-STS cache invalidation, I would > suggest checking the various nuts and bolts both internally, and using > external validators. > > Hope this helps, > -- > Alex > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
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