"In this case? I'd have done the same. If the Big Boss wants me to compromise my professional ethics by intercepting staff email on the fly, they can go fuck themselves."
I was once asked by a senior sales director of a large UK company if I could monitor an employees email. I said that I could but I would not do it under any circumstance but he could probably employ someone else who would. The director exited screaming and shouting at me, I just went back to work.
1 hour later he came back to me and apologised saying that he had a think about it and with me on watch his emails were as safe as anyone else s and he thanked me for standing up to him.