I want to avoid locking people into solutions that work only with Postfix. People should have a choice in what software they want to use with Postfix, be it anti-virus or otherwise.

Coming back to the topic of computer security, the TCP Wrapper is an example of such a safety net. I wrote it when my systems were under attack by someone who appeared to walk through walls.

One bug in an SMTP server can open up the whole machine for intrusion.

As of today, the Postfix mail transport agent has almost 50,000 lines of code, comments not included.

At the time the Sendmail program had a very poor reputation with respect to security, with four root vulnerabilities per year for two successive years.

Sure, but competition is good for the user.

Windows favors multi-threading, which means that a service is implemented by one single process.