Where Entrepreneurs Start
Akismet checks your comments against the Akismet Web service to see if they look like spam or not and lets you review the spam it catches under your blog’s “Comments” admin screen.
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Starting at $5/mo per site
Yes, no credit card required
Akismet is intended for Individuals, Large Enterprises, Mid Size Business, Non-Profits, Public Administrations, and Small Business.
“Spam protection for personal sites, professional or commercial sites and large networks.”