Qmail out of the box works fine, so people will want to use it regardless of licensing restrictions, even when the software does not ship with their system software.

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

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

Lack of documentation is becoming a problem for acceptance.

Qmail out of the box works fine, so people will want to use it regardless of licensing restrictions, even when the software does not ship with their system software.

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.

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.