How does Play by Email (PBEM) work?
Play by Email is a very unique style of Multiplayer. It involves up to 8 people playing a game of Civilization literally 1 turn at a time. After having one person set up a game, a player will take their turn, then save the game, send it via email (out of game as Civilization has no in game function for this) to the next player, and then they load the save in Civilization. While slow, it is still Civilization and all the strategy of the game is there. As long as players take their turn promptly, and there aren’t too many people in the game, it doesn’t last forever. This is also the style used for many inter-site competitions.