I find sp@mx quite easy to use. I had some problems with earlier versions but the latest one (3.2.9) works well and easily. Using Mail, I just use the save as command to save the offending message in raw format to a spam folder and then tell sp@mx to report everything. It just does it. No instructions needed. Apparently there are still things to be worked out with false positive reports that have gotten some ISPs unhappy but the software writer is clearly making rapid progress. For example, it now loads a white list directly from his server to make sure that spam-checking services whose IPs are in the header aren't sent complaints. I think the main competitor for this product is spamcop.net, which is a long-standing website. spamcop is free but requires more work since you have to copy and paste each message one at a time into its interface. Overall, I'd say that sp@mx is worth the extra $20 for ease of use. Support is also good with quick replies via e-mail or via a web forum. One major drawback, hopefully to be rectified soon, is that unlike spamcop, your complaints are in your own name. As another poster on this site noted, this means that complaining could get you onto a spammer's list as a verified real e-mail address if they are running their own ISP and thus receive your complaint note. Hopefully, though, they will instead decide a complainer is not worth having on their e-mail list; of course, they might still include it on lists they sell to other spammers. Anyway, for this reason I will give the product four stars. If anonymous reporting can be implemented I will upgrade it to five stars.