unique-id

Arguments: pb &optional message

pb must be a pop mailbox. message must be a message number (an integer) or nil. If message is a message number, this function returns the unique id of that message. If message is nil or unspecified, this function returns a list of lists of the form (message unique-id) for all messages not marked as deleted.

See imap.htm for more information.

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Created 2015.5.21.