Milter-greylist

> It's an exhaustive list for the situation where you use all the optional
> features (STARTTLS and friends). Of course depending on your setup, you
> might need less macros.

Ok, I got it now. In fact there's already milter-greylist.m4,
which does the correct thing - it adds just those macros to
Milter.macros.* which are actually missing in sendmail's default.

Maybe you could move that at the top of chapter 2 in the README,
as the recommended way (and/or remove the gory details for modifying
the .cf file directly, which nowadays is quite uncommon).

mp.