Taking Out Spam

"Most of the leading anti-spam solutions on the market offer a multi-layered approach to email filtering. These range from the simple - such as keyword filters and databases of blacklisted IP addresses - to the more complex - such as rules-based scoring, Bayesian analysis and other methods based on mathematical algorithms. Most anti-spam solutions do a reasonable job at keeping spam out. The real question is two-fold: First, does the customer want a solution that can be managed in-house or do they want to use a third-party or outsource service for spam filtering? And second, how much are they willing to pay to eradicate the nuisance of spam?" Source: SCMagazine.com