Many MP games run on the mosehansen server. But it only runs a maximum of 23 games at a time, so when it's full, people wait for a game to finish to start a new one.
You could always post an advertisement for a PBEM game detailing the settings you like.
Yarnspinners seems to be looking for replacement players, though it's a specialist game.
Or you could always ask Alneyan to start a new PBEM game as he seems to be unable to resist offers of a new game and perversely enjoys the hosting work. However, even the tireless Alneyan may be getting a little overworked I believe.