The best way to deal with comment spam is to use the Akismet plugin. Akismet is a hosted web service (provided by Automattic, the company that makes WordPress) that saves you time by automatically detecting comment and trackback spam. Once detected, Akismet will put the comments in a queue for moderation / deletion.
It’s free for personal use (actually pay-what-you-want), and inexpensive for all other uses.
For more information about just how Akismet handles SPAM, check out their How it Works page.
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