This project is defunct.
<p>
For implementing greylisting with qmail, try using <a href="http://www.openfusion.com.au/labs/dist/denysoft_greylist">this plugin</a> for <a href="http://develooper.com/code/qpsmtpd/">qpsmtpd</a>, or using <a href="http://www.jonatkins.com/qgreylist/">qgreylist</a>.