How to enable greylisting on your Qmail server
Greylisting is very useful to avoid most of the incoming spam on your mail server. The Qmail packages shipped on Dotdeb have built-in MySQL-based greylisting. Here is how to enable it… Installation First of all, be sure to have Qmail installed from Dotdeb with a version number greater than 1.03-37.dotdeb.1. Then, since we’ll use a MySQL backend to share the greylisting database between several servers, be sure to have MySQL installed somewhere on your boxes. ...