Sendmail
http://www.sendmail.org/
Configuring Linux Mail Servers - how to use sendmail to create a mail server that will relay your mail to a remote user's mailbox or incoming mail to a local mail box (127 visits)
http://www.siliconvalleyccie.com/linux-hn/sendmail.htm
Sendmail - (96 visits)
http://www.soldierx.com/books/networking/sendmail/
Sendmail, Inc. - "Sendmail offers email security and infrastructure solutions, spam and virus protection, routing, email compliance, policy management, mailboxes and mailstores." (67 visits)
http://www.sendmail.com/
The MIMEDefang HOWTO - a software program for sendmail-based mail servers that implements antispam, antivirus, and other customizable filtering on email messages (108 visits)
http://www.mickeyhill.com/mimedefang-howto/