yeah, e-mail is a bit complicated but if you find a group that is using a forum to run their games then time zone is no issue because turns will usually last for a day or two so that everyone playing will have a chance to post their actions.
you just check in on the thread once a day, read up on what the GM has posted and what the other players have stated what they want to do, then post your actions.
the next day you check back in about the same time and see what the result was, it's kinda playing in slow-motion but it turns out pretty cool in that you will start fighting a battle (or something) and by the time you get around to sorting out the loot it's like a week latter.