VGA Planets is a turn-based strategic game that is played by email.
 

It is Science Fiction based as you play with spaceships and planets. Turns are played with a client like WinPlan or DosPlan and send to a person or site that hosts the game.
The game can be played with 11 players, each controlling a certain race. The game is played throughout the world by many players.
You can join a hosting site and play there or create your own host and play against friends or computer players.