Yes that is standard pbem (for those doing this the first time).
The game on the server creates .trn files (turn). And the game on your machine creates .2h files (to host). You have to email the .2h file back to the server at
nav@dom3minions.com and it will male the next .trn file back to you (except the team where all turns go to the captain).
Extended Info:
This actually happens also if you play solo, or if you play direct connect. The only difference is that with those the in and out is automatically handled. Also, its a good thing to know for those wishing to work around the lack of automatic backups.