OK, I just installed it and it doesn't look like there's an option for the type of play that I was looking for. I think it was called "hot seat" play. I remember playing Civ like that: You'd start a hot seat game (meant for multiple people to play using the same computer) and in between turns, you'd simply save the game, email to the next player, they'd open the saved game and take their turn, save the game, and email it to the next player...

I hardly ever have time to sit down to an entire game all at once. I was hoping that I could start a game where just one turn a day could be made. I know the game could last weeks or months like that, but that's what I was looking for...