Comment by mrweasel

qmail was a lot of fun, so was djbdns and daemontools, but you're right it failed to keep up and DJBs attitude didn't help.

We built a weird solution where two systems would sync data via email. Upstream would do a dump from an Oracle database, pipe it to us via SMTP and a hook in qmail would pick up the email, get the attachment and update our systems. I remember getting a call one or two years after leaving the organisation, the new systems administrator wanted to know how their database was always kept up to date. It worked brilliantly, but they felt unsafe not knowing how. I really should have documented that part better.