The Postfix security model is based on keeping software simple and stupid.
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Postfix keeps running even if one Postfix process dies; Windows requires that someone restarts the service.
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One bug in an SMTP server can open up the whole machine for intrusion.
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For many people my software is something that you install and forget. I like to keep it that way.
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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.
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Writing software that's safe even in the presence of bugs makes the challenge even more interesting.
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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.
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Windows favors multi-threading, which means that a service is implemented by one single process.
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My reply is: the software has no known bugs, therefore it has not been updated.