Spam Challenge-Response system

[Brandon Stout]

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Michael Torrie wrote:

> I'm not convinced that RBLs are effective anyway.

When I worked at Verio, if we installed the sendmail RBLs, it would
bring an immediate halt to almost all their spam.  It definitely works.
Furthermore, I never ran into anyone that wasn't able to get email from
someone they wanted to get email from as a result of the RBLs.  It
happens, but it's rare, especially compared to the amount of spam blocked.

Brandon

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