We're running into an issue where sendmail is only receiving one e- mail, but after a client accesses the message via IMAP and moves it to another IMAP folder, the message duplicates but each message has different X- UIDheaders. Has anyone ever seen this type of anomaly before? Is it a bad IMAP client, or a known bug?
You could try if enabling mail_log plugin shows that the client copies the same message multiple times.
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