Challenge / Response (C/R) Spam Filtering


Challenge / Response (C/R) Spam Filtering

| Last activity: 8 years ago
A feature to send a reply email automatically with a challenge to unknown senders. The sender is asked to perform some action to assure delivery of the original message, which would otherwise not be delivered. Senders that have previously performed the challenging action would be automatically whitelisted.


Intriguing idea.... I've seen this implemented in other systems, and I'm still not sure I really like it. Optional would be great, but I notice it still has few votes... -ASB:
by andrew.baker 8 years ago

My Comment

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