Under the terms of the promotion, existing MailMarshal 2006 customers who buy either of the spyware plugins are also eligible for a one-year Image Analyzer subscription for free.

The promotion is open to all users with a valid maintenance contract and ends on September 29, says Riaan Otto, GM of 10Net ICT Solutions. Image Analyzer detects pornographic image content. It scans images for curves and skin tones that are typical of human body parts.

Together, Marshal and Image Analyzer are enabling customers to add anti-porn protection to the MailMarshal SMTP content security filtering solution. Roughly 15% of all spam is pornographic, which represents a high level of risk for companies and executives.

A study conducted last year found that 50% of the largest US firms had instigated disciplinary procedures due to inappropriate or illicit images. Eight out of 10 Fortune 500 companies have dismissed staff for company Internet and e-mail resources misuse, and 25% of UK businesses have dismissed staff for Internet misuse and more than two-thirds of cases involved pornography.