So I installed both Spamicide and Hashcash, and Mollom reported a huge dip in spam attempts in August (from the 17th to the 28th, as seen in the screenshot). However, the amount of spam getting through steadily increased after that. The volume of visits according to Google Analytics has remained about the same over the past year. Now the volume of spam getting through is back to roughly where it was before I made the configuration changes...

I'm about to give up and look at Akismet or Typepad (using AntiSpam for Drupal users)...

I'll keep folks posted.

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