Fals positive "duplicate message" at import

[János Csárdi-Braunstein]

I importing old mail, and i receive many "discarding duplicate message".

Because theese mail from four-five year ago, i qarantee, theese are not in piler (and i search this message, and i got empty result)

I use 0.1.17.3 version.

[János Csárdi-Braunstein]

Ok, i found the problem, it is the message-id.

I searchning the reason why i have two message with same message id.

[János Csárdi-Braunstein]

I found the reason. If the imap client user copy email to other directory, and after this copy to the original folder, create new file for mail in Maildir.