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

The Postfix security model is based on keeping software simple and stupid.

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

However, writing software without defects is not sufficient. In my experience, it is at least as difficult to write software that is safe - that is, software that behaves reasonably under adverse conditions.

Lack of documentation is becoming a problem for acceptance.

I was going to visit IBM for six months as a visiting scientist. Now, six months is a lot of time, so I came with a whole list of projects that I might want to work on.

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