PGP (Pretty Good Privacy) is a good possibility to keep other people from reading your eMail. eMails can be encoded and/or signed. All information you need can be found on The International PGP Home Page.
My Public Key:
(Comment 2002-07-23: Please don't use this public key anymore!)
Type Bits/KeyID Date User ID pub 1024/1676F851 1996/12/06 Michael Oberlaender-----BEGIN PGP PUBLIC KEY BLOCK----- Version: 2.6.3i mQCNAzKoIsAAAAEEAOX77xgVf8cODpNLkD2Ovpmg4RJnd4ocmeu0SQCTuIzPl/aI FZxW0gaLK6sBzjJlc6kG72Qj/FfQHkkmDiBbweogRq/k2HVjquMYU/mqrf0o+191 SSlqvO/xeeFFmLZf/iAUf7GbKTjpDuLFk2nYbjESdQt6qaJM+KKmumEWdvhRAAUR tC1NaWNoYWVsIE9iZXJsYWVuZGVyIDxPYmVybGFlbmRlckB0LW9ubGluZS5kZT6J AJUDBRAyqCLBoqa6YRZ2+FEBAWhcBADKgis411gmOVzYSZMA4wd+OgUehpuZ0lSJ Hr+hahf7elzVTHWErI4wTnIg1F6MUJijd9gwX09G+EApvWF1As5euxkBhcPnL9ie 6V/ul7kOoUWTJflzzBBilkSqyVYEervwfGj1+tJnw399XoZ4KOLcOZ+tQwrbdk2G 5zccLvQ3Dw== =FmjC -----END PGP PUBLIC KEY BLOCK-----