Secure Mailer is an alternative to the widely-used sendmail
program and provides enhanced security and functionality for
the UNIX sendmail program.
Sendmail is responsible for 70% of all e-mail delivered on
the Internet. With an estimated 100 million users, that's
billions of messages daily.
Secure Mailer is fast, easy to administer, security-rich,
and compatible with many existing systems.
IBM is making Secure Mailer available for commercial
deployment on an extremely liberal open source license. Feel
free to use Secure Mailer in the same way you use sendmail
today.
As part of the download you get the signature file
postfix-beta-19981211.tar.gz.sig. With this you can verify
that you received the unmodified source code. The PGP public
key can be found at:
http://www.porcupine.org/wietse/wietse.pgp