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Since a recent upgrade to SmarterMail 14.5.5871, several users are complaining about receiving some messages several times. The users are all in the same domain, downloading messages with POP3, and not leaving messages on the server. I've compared some of the duplicate message headers of the received messages, and they appear to be identical. The disconcerting part of this is that it only seems to affect a few people, and I can't see anything obvious in the logs. Any ideas?