I know at least a few people who are concerned that somebody is reading their emails. Of course, they suspect that the NSA is their problem, but in my opinion there are far greater dangers out there than simply the NSA.
Probably one of the biggest dangers out there is not the fact that a few federal workers are going to read your email and suspect you of being a terrorist, which happens very rarely. A lot bigger issue are the so-called email attacks performed by various hackers who live in countries you normally don’t hear about. If this is the case, instead of sending secure emails, you are sending something so insecure that it can easily fall prey to various hacking attacks unless you have bigger protection that encrypts every message that you send so that it gets only where it is supposed to get.
A regular email that most people use is inherently insecure and it is no wonder that so many people might be concerned whether somebody is reading their messages or not. Probably somebody does that, because regular emails don’t have any encryption as opposed to auto destructing electronic messages. In a corporate environment, lack of encryption can be a problem especially if the competition of a company decides to go after all the sensitive data that might be send from one place to another one.