Targeting Spam > Chris's Wiki :: blog/spam/AntiSpamHeuristicLimits
[Chris's Wiki :: blog] Setting aside all of the other reasons why these things may not be a goodidea, it is worth pointing out that the only reason that theseprecautions work now is that not very many MTAs are using them. In muchthe same way that spammers once used invalid domains in the envelopesender address and now almost never do (because large MTAs startedchecking that), spammers are perfectly capable of adopting to use validEHLO names and to only sending from machines with valid reverse DNS,if they actually need to.
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Some related posts from Technorati and Google.
[Making Light] Making Light: Google's fighting comment spam: The problem with Google's answer as a solution, is that it presumes that comment spammers will be just smart enough to perceive that this makes their efforts less useful and will simply give up posting to blogs that use nofollow. Based on the last 10 years of struggle with email spam, I'd say the more likely reaction will be to post 10 times as many comment spams to 10 times as many blogs and hope some of them are on sites that don't use it.
Reflected tags on Technorati: Blog, Blogspam, Targeting Spam