Now that you're getting a handle on the tricks of the anti-spam trade, the time is ripe to shift some of that attention to preventing outbound e-mails containing sensitive information from escaping the boundaries of your network. Unintended leaks of proprietary corporate content by a company's own employees can result in heavy revenue losses, legal penalties, lost credibility, and conflict with privacy and data security regulations. The market is responding. A number of niche players and industry heavyweights are coming up with technology solutions to tackle the problem. For example, Proofpoint will announce this week Content Security 3.0 suite, according to eWeek. The suite is based on two modules--Proofpoint Content Compliance and Proofpoint Digital Asset Security--the latter of which blocks sensitive information from leaving the corporation via e-mail by classifying content using the same machine-learning engine in the vendor's anti-spam software.