Milter-greylist

I was reading the email about how much of an impact this has on Spam..
I figured I'd give it a try.. 

Within 24 hours, I was a believer.. I've since loaded it on almost all
of the mail servers I deal with.

The one question I have relates to the reject message that is
initially delivered. Now I'm running 1.5.6. It was built via the
FreeBSD ports. Is there a configuration option that alters the text of
the reject message. 

I'd like to hide any mention to greylisting.. No reason to share what
I'm doing.. Heck, lots of us do it and the spammers will alter their
behavior..

Just thinking out loud..

Thanks..