Super Duper Games
Play various abstract strategy games (chess falls into that category) on this site. My username their is 'OnePageWars'. My personal favorite is homeworlds. There are, however many others, some very chesslike. Membership is 100% free.
Check out this site; all play is correspondence style.
P.S. SDG employs a unique timing mechanism that is worth understanding. It is fairly easy to make the clock act the same way as in chess.com if you so wish. Their system gives more options, though.