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Fighting image spamFighting image spamPosted Aug 24, 2006 4:34 UTC (Thu) by warmcat1 (guest, #31975)Parent article: Fighting image spam
These CPU-intensive solutions won't scale.
Greylisting remains the most powerful tool until the spamming software gets smarter.
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Fighting image spam Posted Aug 24, 2006 8:39 UTC (Thu) by dion (subscriber, #2764) [Link] I agree, greylisting is a very useful technique, combined with a realtime database of currently spamming machines it's almost undefeatable.
The tricky bit is getting the realtime database fast and accurate enough to classify a spamming server before the first greylisting wears out.
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