In a previous life I wrote the software that controlled my physics experiments. That software had to deal with all kinds of possible failures in equipment. That is probably where I learned to rely on multiple safety nets inside and around my systems.

My reply is: the software has no known bugs, therefore it has not been updated.

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

When I write software, I know that it will fail, either due to my own mistake, or due to some other cause.

Like all software, Qmail can survive only when it keeps up with changing requirements.

Writing software that's safe even in the presence of bugs makes the challenge even more interesting.

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.