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AHBL DNSbl Code Responses & Meanings

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To help you understand why an IP is listed in our DNSbl database, we have established the following policies:

Open Relay (Response: 127.0.0.2)
This IP address is listed because it is an open SMTP relay - either a single relay, or a multi-stage relay.  An open SMTP relay means that a third party can send e-mail through the server on that IP address without authorization (to spam, for example).

Open Proxy (Response: 127.0.0.3)

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