If it's not anything illegal, or dangerous for the company, forget it.
In my country what he did would have been illegal (and once we had to identify and remove a mail admin who was monitoring the mail of a woman he got "too interested" in...)
Anyway, what people do in their free time is up to them. As long as what they do is not illegal, nor is a true risk for the company, is not a problem of mine - unless, for some reason, I'm very close to one of the involved people and I can understand the situation fully.
Did he sent it to the wrong address? It should have received the standard "cannot deliver" message. I received it by mistake? Delete it.
Sure, it can deeply change the opinion I have about them for ever...
Biting the hand that feeds IT
