Because XBoard can detect checkmate and stalemate, cmail handles game termination sensibly. As well as resignation, the ‘Action’ menu allows draws to be offered and accepted for cmail games.
For multi-game messages, only unfinished and just-finished games will be included in email messages. When all the games are finished, they are archived in the user's archive directory, and similarly in the opponent's when he or she pipes the final message through cmail. The archive file name includes the date the game was started.