[Mobhack]

There is secure mode PBEM for that - but it is a pain to use (typical problems occur if a free demo game user tries to "reuse" the same slot for several games, thus causes hiccups, secure slots must be used for one ongoing PBEM only).

But really, the best you can do is find an opponent who does not play squirrelly and use basic security. Basic has less hassles. Finding such a reliable opponent (and one who sends turns back frequently enough) is the problem.

Squirrelly opponents - just don't play them again.