MailBlocks controversies
Controversies tied to this brand in public sources. A listing is not a finding of fault.
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Challenge-response patent-troll controversy
MailBlocks acquired rights to patents US6199102 and US6112227 and pursued other companies over challenge-response spam filtering. Critics disputed the novelty of the claimed invention, noting that the method had been publicly described before the patent applications. Companies identified in the reference material include Spam Arrest, DigiPortal, MailFrontier, and EarthLink.