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ImapClient.FlagMessageByUID(UId, Flag.Unflagged)I want to remove a flag from the mail so i am using this function but it does not work for me.

I had used this function for other flag for example read, flaggged etc and it is working fine for other flag but not working for Unflagged.

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Negative flags (unseen, unflagged) can't be assigned. You need to remove positive flags (seen, flagged) instead. Please use Imap.UnflagMessageByUID:

ImapClient.UnflagMessageByUID(UId, Flag.Flagged);
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