Milter-greylist

The docs and my config indicate the SMTP AUTH should override the greylist,
but it's not happening.

This is from sendmail.mc -- what am I missing?

define(`confMILTER_MACROS_ENVFROM', `i, {auth_authen}')dnl
INPUT_MAIL_FILTER(`greylist',`S=local:/var/milter-greylist/milter-greylist.sock')dnl

-- 
  Steve