There is a competitor to gain market-share against well known Askimet named Defensio, which has been acquired by Websense. Akismet is backed by Automattic, makers of the widely used WordPress content publishing platform.
Both anti-spam systems allow free non-commercial and varying prices for commercial users. Akismet the advantage of being part of the WordPress distribution package which is now used by millions of sites. The latest version of WordPress, 2.7 Coltrane released in December 2008, has already been downloaded well over 1,520,000 times as of January 2009 – all of which makes for a readily available user base.
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