UID for syncing messages

Jethro Tull heavytull at hotmail.com
Tue Jun 12 19:02:15 BST 2018

does offlineimap use the Message-ID in the email header to see if it is already in the destination folder or does it use a UID the imap server uses to number the emails? I noticed that mbsync was using something else than the Message-ID in the header. The latter is what mutt uses to mark emails as duplicates.
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