"Problem with activation" : spam on Drupal 6

Submitted by Anonymous (not verified) on Thu, 03/10/2011 - 01:54

I habe a Drupal site and have a problem for a couple of weeks: I got automated forum topics named "Problem with activation" with a link inside my site like http://example.com/?somethinklooklikemd5

Why this is happens and how can I prevent it?

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