So if you think you can be sneaky and encrypt your e-mail, not because you have something to hide, but because you think that it's bad manners reading other people's mail, think again. Because they think the other way around ;-) And if you think your e-mail is encrypted SO WELL, think again again ;-) Big Brother is here to stay, and I'd bet money he can break your encryption. So what to do if you actually believe in a 'right to privacy'?
My advice is: "Start believing in something else, something more obtainable ;-)" Sure you can send a regular snail mail letter, but after finding out what they can do with internet communication and how many analysts that does require, I wouldn't be surprised if they have the means to see through those paper envelopes too.
An old saying modified : Just the fact that you're paranoid doesn't mean they're not reading your mail !