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AFAICT, the UW IMAP server, for whatever the reason, passes the timestamp in the mbox "From" header on to the client (as the "received" time?). Since no timezone info is given in the timestamp, either the server or the client makes the assumption that it's in localtime (when in fact it's GMT). Therefore, my naive solution is to simply append " -0000" to the timestamp, which seems to make everyone happy. Whether or not this is proper for the mbox "From" header, I don't know.