[Exim] Greylisting HOWTO for exim

Folks,

After looking at a few other greylisting sites, I decided to roll my own.

    http://www.wizzy.org.za/article/articlestatic/20/1/2/

Uses mysql and exim4, and the page describes what you must do to get
mysql up as well, for those who are unfamiliar with databases.

Feedback welcomed.

Cheers,    Andy!