Fighting email spam

I want to extoll the virtues of another free program, this time Mailwasher, which is a great tool in the fight against email spam. I have used it for years, and it's brilliant - also very simple. Mailwasher allows you to view every email before you download it to your computer, read the text if you want, and decide whether it's safe. If you are in doubt, delete the email and it never gets to your hard drive. You can set up lists of friends whose mail you trust, and even bounce spam-like mail to its source (the theory being that the sender will think that mail address is not valid). The fact that it was invented in Christchurch might bias me a little, but it really is good.