Honestly, I would take the advice above and keep it cool. For one thing, it was a year ago. If there's just one picture, from a year ago, that he's not hiding, he probably doesn't think it's a big deal. Even if othergirl did randomly send him an improper email, it could have been a one time thing, and he fell into the guy mentality of "Oh, boobs. *Right-click-save*" I think the least favorable thing you could do is to attack him about it when he gets home. At least personally, that puts me right on the defensive. I would mention it, ask about it, and if it is other girl, tell him you would prefer that he not have that sort of communication with people online.
Over the course of my relationship history, there's been plenty of things that I did that upset my SO, without even realizing it would. Men can be boneheads sometime. If you can approach him reasonably with what bothers you, he should be able to respond reasonably with an apology, and a promise not to do things like that in the future.
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Veritas Vos Liberabit
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