Some Carbon Copy mails disappear/never arrive

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capvar
Posts: 9
Joined: Fri Jun 21, 2019 9:24 pm

Some Carbon Copy mails disappear/never arrive

Post by capvar » Sat Jul 10, 2021 8:31 pm

We face a strange issue with some mails being cc to our mailboxes.
Example: An email is sent to A and cc to B (or sent to C and cc to A and B). A may get the mail but B not (and the opposite).
Checking the logs are perfect. I can see 2 transactions and 2 different XXXXX..XXX.MAI files created one for each mailbox, but searching manually for the MAI of the missing mail has no result (like never actually created).
It happens like less than 2% of the time, but it happens. I am monitoring it for the last 6 months, without finding a pattern (seems random)
I was using 10.31, last week server crashed and now I am on 10.35.
The problem is still on the new server, with the new version.
I am using magicspam for spam prevention (always these mails are marked as not spam) and in the logs seems like being delivered to the appropriate receipients (like the logs). Any idea how to investigate further? Anyone with the same issue?

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