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Is there a way with your mail.dll IMAP library product to mark a mail as unread again?

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You can use Imap.MarkMessageUnseenByUID method it removes \Seen flag from the specified email.

Depending on your scenario you may want to use Imap.PeekMessageByUID instead of Imap.GetMessageByUID, so you don't mark messages as seen when downloading them.

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