spamfaqs.com

Most forum spam consists of links to external sites, with the dual goals of increasing search engine visibility in highly competitive areas such as weight loss, pharmaceuticals, gambling, pornography, real estate or loans, and generating more traffic for these commercial websites. Some of these links contain code to track the spambot’s identity if a sale goes through, when the spammer behind the spambot works on commission.

Spam posts may contain anything from a single link, to dozens of links. Text content is minimal, usually innocuous and unrelated to the forum’s topic. Such text is included to prevent the post being caught by automated spam filters that prevent posts which consist solely of external links from being submitted. Full banner advertisements have also been reported.

Alternately, the spam links are posted in the user’s signature, in which case the spambot will never post. The link sits quietly in the signature field, where it is more likely to be harvested by search engine spiders than discovered by forum administrators and moderators.

Recently, a very destructive forum spam attack has been propagated by inserting into comments redirect domains with an automated posting script like Xrumer. These domains redirect a user to pornographic Websites. If a user clicks on the image or attempts to close the Website an ActiveX codec will be downloaded as a Zlob Trojan.

Applying careful restrictions can seriously impact bogus and spambot registrations. One approach consists in the denial of registration from certain domain extensions that are a major source of spambots such .ru, .br, .biz, or freebase addresses such as “gawab.com”. Another, more labor-intensive, consists in manual examination of new registrants. This examination looks at several indicators. First, spambots often delay email confirmation by several hours, while humans will confirm promptly. Second, spambots will tend to create user names that are unique, and unlikely to already be used in the forum, preferring “John84731″ or “JohnbassKeepsie” to the much more common “John.” Third, using a search engine to investigate, one finds hundreds, if not thousands of profiles using the spambot login name, sometimes with the diagnostic spam post, or “banned” label

There are software available to block all spams that you might receive. So get a  spam blocking software.  These software programs are out there that you can simply purchase online. You may refer to www.cloudmark.com or www.mailwasher.net.  But if you got the budget, you may also buy a professional version.  Geting a spam software will save you time.  The software is not absolutely foolproof, but they really do help. Usually you have to do manual set it up to block certain types of email.