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All the Perl that's Practical to Extract and Report

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  • The difference between C/R with mailing lists and C/R with sending email is quite different. As you point out, C/R with mailing lists works because you are opting in to receive messages, while poorly designed anti-spam C/R systems put barriers to sending messages.

    Sounds to me like we don't quite understand the problem fully. Or, rather, the current C/R anti-spam solutions are simple, obvious and totally wrong.

    To get the desired effect, a general purpose anti-spam system needs to work on the receiver's

    • by tombu (4555) on 2003.09.11 12:45 (#24127)
      I completely agree that C/R systems should treat mailing lists differently than regular email. Fortunately, almost all mailing lists set the header "to:" field to the name of the mailing list. A C/R system should not challenge a message if the header "to:" is not to the user of the C/R system. It should put these messages into a special bin and give the user an easy way to say that this "to" is a mailing list (and the messages should be allowed to pass through). This is what knowspam.net does (I am the author of knowspam).

      Also, a C/R system is less bothersome if it only challenges a senders address once, even if the sender sends email to more than one of the C/R systems users. If the sender responds, then they should be "verified" for all of the C/R systems users. Obviously, this creates a hole for spammers . knowspam closes this hole by requiring that the sender re-verify themselves after they have sent mail to 50 knowspam users that did not have the sender on their whitelist already.

      The appeal of C/R systems is that they are very effective at blocking spam ( Man who gets 3,000 spams a day [knowspam.net]). I don't think they break the internet -- spam has broken the internet.