I was using formail in a utility script, but it disappeared when I upgraded to OS X El Capitan (10.11)? Apparently, it and procmail are gone.
What's a good way to get formail? Build it from source? It's not in homebrew (yet).
It’s included with the procmail formula:
brew update && brew install procmail
procmailpackage – glenn jackman Oct 16 '15 at 22:14