AtomGames
Offers instructions and free board games, including chess, go, checkers, reversi, and tic tac toe, played through e-mail clients that support HTML.
EmailDraughts.com (EmailCheckers)
Play draughts (checkers) against a friend via email. (Flash based game)
Free Falling
A tactical space combat simulation played on a hex based board.
Friends with the World
play email scrabble and Battleship also have many fun game links and a Banner Exchange with over 600 members
Online Correspondence Checkers
Free live/correspondence 1 on 1 and team checkers. Checker ratings, checker ladder, Top 40, library, checker pen pals, profanity filter, email notification, instant messaging, and move alarms.
Richard's PBeM Server
Richard's PBeM Server (pbmserv@gamerz.net) exists so that you can play a variety of games with players around the world by eMail. Among the 100+ games supported are: Chess, Checkers, Backgammon, and Othello.
Shogessi
An original 2 or 4 player Chess/Shogi variant, designed for use with the CyberBoard freeware utility.
The Pixie Pit
Play free e-mail Scrabble. Supports two, three and four player games. Post a message with the score. Also has chat and a forum. Over 1000 two-player games in 25 game rooms.