If You Use Challenge/Response, It May Be Your E-mail Delivery That Is Challenged
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If you are one of the thousands of users who uses a challenge/response system to stem the flow of e-mail into your inbox, you may be missing out on more than just spam.
One of the inherent flaws in challenge/response systems is that they don’t work if the sender never receives the challenge.
And that’s just what has been happening in the case of e-mail sent by users at both Earthlink and AOL. [Continued…]
