Yes, because: a) The privacy of anything that comes to me via USPS is legally protected, and there is no such legal protection on the net. No ISP admin will go

Yes, because: a) The privacy of anything that comes to me via USPS is legally protected, and there is no such legal protection on the net. No ISP admin will go to jail for opening and reading my mail just because he felt like it. b) You can't trust anything that comes in email. I get email from my bank all the time, and it's never from my bank, it's always phishing attempts. If a) and b) can be satisfied, I'll start listening.