Other Anti-Spam Methods
The following methods are less effective in general and therefore less useful for most organizations. However, they may be useful for some people in some cases. They are not covered elsewhere in this book, except peripherally or in an appendix.
For the benefit of all who use email, it is a good idea to report spam. Although this is an after-the-fact method, it can reduce the amount of spam that everyone receives in the future. One of the best-known sites for reporting spam is http://spamcop.net. This and other ways of reporting spam are covered in Appendix B.
Charging per Email
Some people have suggested charging all senders per email message sent. This would require significant changes to the underlying ...