Hi,
It's not UW-IMAP (the server). It's PINE or Alpine (the client). Those are usually found in on-disk mbox files that have been created by PINE/Alpine. The message is ignored by PINE/Alpine (obviously), but when you switch to a different mailer, it doesn't know to ignore it (and shouldn't be expected to). AFAIK, the only solution is to delete the messages.
i do not think it is client related. (never heared of this clients) Seems to be a normal dovecot internal message (timo?) But dovecot should not deliver this message as real mail, regardless of which client is used. Furthermore we face this issue only by updating to 1.1.1, all earlier versions did not show this behavior.
Andre
