We have a client using mail.app using imap to connect to zimbra server. Every now and then he is having a sent message VANISH. He sends the email, then goes into the sent folder to look at it again, it appears there for a second and then disappears.

I have checked all the normal mail logs, but beyond the email being sent correctly and reaching all the recipients I am unable to see any sign of anything happening.

It is a 1 in 50 messages type of issue so is proving difficult to track down. My imeddiate feeling is that it is an issue with the client, but just thought I would post a message here to see if anybody has experience this in the past.

I have checked the following;
- NO RULES -> there are no rules on the client to act on messages
- It is not in the junk folder
- The message is 100% gone from the computer. NO trace
- Checked via the web interface and the message is not there either.

Does anybody have experience with logging IMAP either at the client side or at the server side ?

Any help would be appreciated.