wounded in the line of duty
Unfortunately I am not familiar with Drupal but ideally have a look if you can see where the comments are coming from, then cross reference them with some GEO-IP.
I found by firewalling off .cn .in .ro domains my spam dropped by a considerable amount, most spam freelancers are from those countries..
It would be great to have an added feature in blog software to deny commenting from particular IP ranges.
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