It makes sense - in order to deal with greylisting, spammers need to do twice as much work or more, which slows them down, and their game is all about number of messages sent per second. They rarely, rarely retry.
If they start trying a second time regularly, I'll just up the number of retries required. Short of requiring a sending mail server to perform some processing on my behalf, I can't think of a more effective spam deterrent than greylisting.
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timeasmymeasure
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Date: 2009-05-07 05:11 pm (UTC)If they start trying a second time regularly, I'll just up the number of retries required. Short of requiring a sending mail server to perform some processing on my behalf, I can't think of a more effective spam deterrent than greylisting.