Removes the flags specified by MessageFlags from the messages specified by MessageSet .
public void unsetMessageFlags();
Examples of possible flag values are server dependent, but can include:
|\Deleted||Mark a message as deleted (for removal by later ExpungeMailbox).|
|\Seen||Mark a message as read.|
|\Answered||Mark a message as answered.|
|\Flagged||Mark a message as flagged.|
|\Draft||Mark a message as being incomplete (under composition).|