Pine is an openly developed utility for reading, sending, and managing electronic messages; designed by the Office of Computing & Communications at the University of Washington.
Sendmail is a mail transfer application which is the program that moves mail from one machine to another; with automatic routing to network gateways, and flexible configuration.
MailScanner is an openly developed utility which serves as an email virus scanner, as well as spam tagger; supporting Postfix, McAfee, eTrust, and other anti-virus scanners.
