secure PBEM games

[Tide1]

Steel Panthers and the Campaign Series has the message system. Last week I got an email from an opponent I've played against for six years saying he lost track of time and had to take his son to baseball so I would be seeing the message when the turn got back to me.
He showed class and respect. Would I of thought he had cheated? NO. He can kick the crap outta me without it. Did I need to know he had to take his son to baseball? NO. Did I want him to waste time composing and sending me an email without a turn attached? NO.
To have it in a game series like Panzer Campaigns would be....well lets just say a waste of time.