UID for syncing messages

Jethro Tull <[email protected]>
Newsgroups gmane.mail.imap.offlineimap.general
Message-ID <HE1PR0801MB172308BDF0E355BA5CD92D34AD7F0@HE1PR0801MB1723.eurprd08.prod.outlook.com>
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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OfflineIMAP homepages:
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