Flystrike Spam Interrogator allows you to analyze e-mail messages before downloading them from the POP server. The program then assigns a score based on an inventory of tests to help you identify spam messages. Each message is then marked as good, possible spam or spam and the reasons for it are indicated along the side of the mailbox view. It includes several unique features like an option to compare messages based on a MD5 hash, creation of your personal IP block list, and blocking based on URLs found in the message (most spams contain some sort of URL). Additional features include optional complaint messages to the ISP, color coding of messages and more. We found it a little complicated to use and didn't like the interface that much.