1. Read this (and related articles): http://www.idg.net/idgns/2001/09/14/USATTACKSenateOKsUse.shtml

2. To protect your civil right of privacy, get this software:
   either GnuPG open source, free for any use
   or     PGP   open source, free for non commercial use only.
   PGP integrates nicely with programs like Eudora (recommended) and Outlook/Outlook Express
   (not recommended). Both are available for almost any platform, namely MacOS, Linux, Windows
   and many others you've never heard of.
   Both packages are compatible with each other, so if you don't like the one any more, you can
   install the other and use it instead. (There's a class of operating systems called Unix that
   works likewise.)
   
3. Install the software and generate a pair of keys and upload your public key to a key server.
   How to do this is explained pretty well in the PGP package.
   
4. Tell other people about PGP/GPG and start encrypting your emails. The point is that if
   everyone uses it, it's harder to forbid. Even if you don't have anything to hide, you
   don't want people to read your email, do you?
   
5. Here's my public key. Once you import it to your keyring, you know my email address.

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: PGPfreeware 6.5.8 for non-commercial use 

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=oruV
-----END PGP PUBLIC KEY BLOCK-----