@MAIL [(player) = (message], @REPLY (message), @FROM and @NEXT
@MAIL (player) = (message) sends mail (message) to (player).
@MAIL reads your first message. You MUST delete your first message
(using @NEXT) before you can Read your next mail message.)
@NEXT deletes the current message and displays the next, if any.
@REPLY (message) sends a reply to the (player) that sent your current
@mail message. (note that there is no = between the @reply command
and the message body)
@FROM shows all the players who've sent you mail, and how long ago.