Sync dovecot to cyrus imap, creates many X-OfflineIMAP headers

[Sebastian Spaeth]

> With UID/UIDPLUS isn't it now possible to save the list of UID's for each folder, in the sqlite database, at the end of the current run of OfflineIMAP ?
> 
> At the start of the next run, compare the UIDs in each folder to the previously seen list of UIDs for each folder ?
> 
> This method lets us track movements of messages between the folders, ie when a message is not "new in a folder but we don't know where it came from" just "this message was simply moved from Inbox to Trash"

Nope, UIDs are folder specific, they have no meaning for other
folders. The folders UIDVALIDITY value plus a mails UID characterize a
mail uniquely, but ONLY in that folders, other folders will happily use
the same UID for different mails.

Sebastian
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