We thought pbem had any problem, but it seems that the normal sequence (like Combat Mission for example) has some problem.
Usually it should be Player A create deploy and give orders, send mail to B; Player B give deploy and give orders and send to A; A plays (dispatch) and give order and send to B...and so on
We tried on these days every night and day in exchangig files and in listening the forums, and even some user that thought he did it.... but the pbem need to be tuned for sure.
JMM is working on it from yesterday and we hope to have a patch (not only for pbem but for other things) on Sunday (please this date is not mandatory, we hope Sunday)
Sorry for that, however the direct multiplay works well (players need to set the same battle speed remember it)