Where can I get formail for OS X El Capitan (10.11)? 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 &amp;&amp; brew install procmail