Premail adds support for encrypted e-mail to your mailer, using plain PGP, 
PGP/MIME, MOSS, or S/MIME. In addition, premail provides a seamless, 
transparent interface to the anonymous remailers, including full support 
for Mixmaster remailers and the nymservers. Nymservers provide crypto- 
graphically protected, fully anonymous accounts for both sending and 
receiving e-mail.