To my knowledge this system is unique.
It is almost identical to SpamKiss:
http://www.spamkiss.com/
and it shares the same problems.
I strongly disagree. Spamkiss appears to be almost identical to
www.Zoemail.com. I already contrast my system with Zoemail. With Spamkiss
acquiring a new sub-address (or "token") is cumbersome. It is also very easy
to automate a bot to request new "tokens" from spamkiss. My CAPTCHA is
extraordinarily resistant to bots, and senders who do not use a proper
sub-address are instantly sent the sub-address within a CAPTCHA (this is
infinitely more convenient of course).
Michael G. Kaplan
--
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