Postfix - a secure alternative to Sendmail

It is now widely recognized that Sendmail, the most widely used UNIX mailer, has certain security gaps, many of which are discovered and reported on a daily basis by researchers and users. One such researcher is Wietse Venema. Venema is a programmer and inventor of numerous irreplaceable tools for UNIX administrators. Examples include SATAN (created together with the equally well known researcher, Dan Farmer) and TCPWrappers, of note recently for allegedly having been illicitly distributed with a Trojan horse inside by a group of malicious hackers. For some time now, Venema has been pointing out to the scientific community just why Sendmail will never be completely secure. Naturally, criticism of a product should be accompanied by suggestions - or better yet - alternatives. Thus, Venema, during his time with the T.J. Watson research laboratories, was driven to launch the Postfix project (a.k.a. Vmailer or Secure Mailer) under the auspices of IBM. As Venema says, there is a dual objective: to give the user an alternate Mail Transfer Agent (MTA) to Sendmail while creating a secure mailer like the well-known Qmail, another program in this category, created by Dan Bernstein.