You can register with MARTI but omit your email address fro the triple A game set up. However, triple A needs (I think) a minimum of 2 email addresses (To and Copy) so this will only work for you if there are at least 2 other players in your game.
Of course you will also have options in your email set up. All my MARTI emails go direct to junk. There may also be an option of blocking them I guess.
