Guardian2003 writes:  

Code-Authors.com releases its new Spam Stopper module.
Designed to replace the older Spamlist Database Module, this new module offers some very extensive features.

1 Check incoming referer to see if your own site is listed on the referers site (a form of a back-link check )
2 Check incoming referer to see if the referer contains banned words (viagra, vwar etc)
3 Check incoming referer against several third party referer blacklists
4 Check incoming referer to see if it has an open relay (most spammers can be caught this way)
5 Facility to 'whitelist' domains at will
6 Facility to 'blacklist' domains at will
7 One-click facility to report spammers to the Code Authors spamlist database
8 Facility to report hacking attempts to the Code Authors database
9 Extensive color coded logs to enable admins to see 'at-a-glance' which referers are black/white listed
10 Facility to maintain your own list of 'bad words'
11 Facility to ban domains and also send that data to Nuke Sentinel (tm) blocked IP table to permanently block the domain.

Registered users can downloaded it from
http://www.code-authors.com/modules.php?name=Downloads&cid=4