America Online Inc. acquired Web-based e-mail solutions provider Mailblocks Inc. on Wednesday. Terms of the deal were not disclosed. Mailblocks is most widely known for its "challenge/response"
anti-spam technology. AOL will implement Mailblocks' technology across its network in phases. Users will activate the new services through a series of downloadable upgrades. This is the second major
acquisition of the summer for AOL; the Dulles, Va.-based company acquired Advertising.com in June.