Some little while ago, I changed the name of a file used in the comment process, and submission of comments by spambots ceased. Comments are now open, until another wave breaches the battlements. I’m betting that the number of good comments that I won’t have to moderate before then will exceed the number of spamments that will get through before I see it and flip the switch again.
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No trick works forever. They learned about that one, and also started sending bogus Trackbacks. (They’ve been spamming HTTP referral logs for quite a while now.) But the new version of WordPress promises to make them easier to handle.