How in the world does an e-mail arrive anonymously? There needs to be SOME way to trace it... and IP address or something.

If I were you, I'd clue the husband in to the fact that you had received anon e-mails that were probably from the girlfriend before she went to boot camp, that they stopped arriving while she was at boot camp, and they resumed the moment she returned. I'd tell him that the girl he's involved with is obviously and intentionally splitting up his marriage over this affair, so whatever she's been telling him in private, she's been messing with your mind behind his back, and he needs to know waht kind of girl he's involved with.

You need to rid yourself of him, because clearly if he were not with some vile woman who was INTENDING to break up his marriage, you'd have had no clue, so the man is totally untrustworthy and it's over. But HE needs to know that his belief that he's good at keeping secrets, sneaking around, and that YOU are the one who instigated teh divorce without sufficient provocation is absolutely wrong.

Who knows, maybe he'll find it charming that the girl is willing to fight so dirty for him... or maybe she'll convince him that it's not her, but some acquaintance of theirs who is reporting every move to you... but he will always know that HE cannot trust his new girl any more than YOU were able to trust HIM.

I think that would be a fitting punishment for a cheater who destroys your trust... to find himself unable to trust others because THEy have been hiding from HIM and lying to HIM!