It's neither fast/memory efficient nor easy to configure. Back when we created our email infrastructure (10yrs ago) we deeply evaluated qmail and postfix. Postf

It's neither fast/memory efficient nor easy to configure. Back when we created our email infrastructure (10yrs ago) we deeply evaluated qmail and postfix. Postfix beats qmail on both counts by a huge margin. The rest of the qualities do stand. We kept tinydns from that evaluation, and gladly so. It's a marvelous piece of software, never breaks on its own, requires near zero maintenance.