Chess client for e-(g)mail
GamesByMail 

Scott Michtell just introduced me to GamesByMail to play Axis &amp; Allies, and I noticed that it has chess as well.  

All you need is an e-mail address to create a small profile, same thing for your opponent, and you're ready to play.  You should get e-mail reminders when it is your turn.  

I haven't tried chess there yet, but if it's anything like A&amp;A was, you should be in good shape.