[linux-elitists] Paul Graham on C-R systems

Nick Moffitt nick@zork.net
Sat Oct 4 20:18:09 PDT 2003


http://www.paulgraham.com/stopspam.html
> The advantage of challenge-response filters is that they let through
> very little spam. (At least, so far.) The disadvantage is that
> they're rude. Spam means extra work for all of us. By using a
> challenge-reponse filter, you're saying that you expect the extra
> work of keeping your inbox free of spam to be done by the people who
> send you mail.
[...]
> I have several email addresses that all get forwarded to one
> account. If someone using a challenge-response filter sends me a
> question, the reply will come from an address their filter hasn't
> seen and I'll get a challenge back. If such challenges seem rude
> when you're the one initiating contact, imagine how they seem when
> you get one after replying to someone's question. I never bother to
> respond, and I'm probably not the only one.
[...]
> What happens when spammers happen to use some innocent person's
> address as the from-address in a spam, for example? What happens
> when spamware authors (who aren't stupid) figure out how to spoof
> challenges? How do you create a challenge that blind people can
> pass?

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