[Baypiggies] Challenge/Response email systems
DennisR at dair.com
Fri Jun 16 18:29:50 CEST 2006
At 08:58 AM 6/16/2006, you wrote:
>4. Is there anything as bulletproof as CR, but without the problems?
>And I am not asking about
>better filters (that's just an ongoing battle against better spam).
I think so and have implemented such in my latest version of SpamAI:
Guilty until proven innocent
Only whitelisted email is directed to your inbox. The rest is reviewed or
ignored as you see fit.
Because this algo and C/R are both explicit whitelist systems, they are
Now on to "the problems"... A C/R "shares" *your* spam problem with people
who send to you. Now, there is going to be an asymmetry in who finds the
message valuable. Consider this table based on who finds the message
hi importance to sender, lo importance to receiver
The sender does the work to go through C/R and the recipient gets a message
they are not interested in. Sender is irritated but so what? - for C/R
low importance to sender, lo importance to receiver
message is lost. + for C/R
hi importance to sender, hi importance to receiver
The sender does the work and recipient receives message but at the cost of
irritating sender on something both consider important. Both + and - for C/R
lo importance to sender, high importance to receiver
The message is lost and the sender is *really* irritated. - for C/R
Including the ambiguous case, there are 3 - and 2 + for C/R. C/R works
less well when there is an asymmetry in the importance of the
conversation/message. I think the sender's responsibility ends when they
send their message. From that point forward, it is the recipient's sole
responsibility to act/not act.
| Dennis | DennisR at dair.com |
| Reinhardt | Powerful Anti-Spam |
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