I found this website and thought that it would be really cool if you guys could write a program like this challenge/response that worked with Declude spam. I would absolutely pay for it!
http://about.mailblocks.com/features/challenge.aspx
We actually started work on this a while back, but stopped. While it is extremely effective in reducing spam *you* see, it also has a very high false positive rate, and other problems.
Top 9 reasons not to use C/R
[1] You end up being a spammer (the majority of spam sent to you will result in confirmation requests being sent to innocent victims)
[2] Spammers now send pretend confirmation requests, presumably to make people less likely to respond to C/R requests
[3] Many people respond to C/R requests that they never initiated
[4] C/R companies have been known to send out spam and harvest addresses of people sending to their customers, and apparently sell those addressses to spammers
[5] The C/R system is patented, so most anti-spam programs using C/R have legal liabilities waiting to be ironed out
[6] Confirmations sent to mailing lists won't work
[7] Confirmations sent to others using C/R cause problems
[8] People like me that offer a free service (helping people with DNS) end up losing money (by spending time investigating and responding to C/R systems, dealing with spam received as a result, etc.) and sometimes get fed up with C/R systems and eventually stop offering free advice (never knowing how many people won't get it), harming everybody.
[9] Legitimate E-mail from automated services won't be seen (such as when ordering products online)
-Scott
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