Postfix keeps running even if one Postfix process dies; Windows requires that someone restarts the service.

This will surprise some of your readers, but my primary interest is not with computer security. I am primarily interested in writing software that works as intended.

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

Postfix keeps running even if one Postfix process dies; Windows requires that someone restarts the service.

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

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

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.