Something that has surprised me in the free unix world is the ongoing strong support and emphasis on sendmail. I notice openbsd highlights updates in its releases also.

I don't know much about MTAs. From what I read, sendmail has a bad reputation for being complicated and unwieldy. I've played around with it a little and found it cryptic. But mail systems seem to be inherently complicated, so maybe sendmail attracts a lot of criticism that could is in fact only slightly less true of all programs of that sort.

What's the thinking about ongoing strong support for sendmail?