diggle - 8:44 am on Jul 25, 2003 (gmt 0)
I have been using Mailwasher for a couple of weeks now with great success. This enables me to bounce back spam but also to check emails before downloading. For instance, an acquaintance sent me a picture yesterday that was nearly 2 MB's! I was able to intercept it and delete it. It also checks against Spam Cop's blacklist of known spammers and, of course, you can set your own filters and whitelist\blacklist.
You can also set it to delete and\or bounce automatically. Best of all, it's free although a donation to the author is welcome - and thoroughly deserved.