With spam blocking becoming a checklist item for network managers, anti-spam companies are developing complementary features and turning to new ways to deliver their technology with hopes of distinguishing themselves in this heavily crowded market.

Observers say the anti-spam market is taking the same turn the anti-virus market did years ago when it went from an over-hyped sector full of start-ups to just a handful of key players whose products dominate the market.

By Cara Garretson at Network World.

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