Creating Filter Rules for Pegasus
Pegasus has some very powerful mail filtering options. This document will just cover the basics.
To set up a filter, choose the "Tools" button and follow the example below.
A dialog box like the one below will appear.

Choose "Add Rule" and a dialog box like the one below will appear. This example will automatically delete any email if the string "porn" appears anywhere in either the subject or sender fields of the email header.

There are many more options you can use. Visit Pegasus's website for more information