Back In The Day, there was a BCP for shutting down a DNSBL that included running a daily check of the IP 127.0.0.1 (which should never hit), IIRC, as well as 127.0.0.2 (which should always return a hit); and if my memory serves, if either criteria was different (both listed or neither listed), the DNSBL should be flagged as not to be trusted.
This is from memory, I remember a discussion … a decade or so ago? Aloha, Michael. -- Michael J Wise | Microsoft | Spam Analysis | "Your Spam Specimen Has Been Processed." | Got the Junk Mail Reporting Tool<http://www.microsoft.com/en-us/download/details.aspx?id=18275> ? From: mailop [mailto:[email protected]] On Behalf Of Laura Atkins Sent: Thursday, January 21, 2016 9:13 AM To: Lyle Giese <[email protected]> Cc: [email protected] Subject: Re: [mailop] Spurious 'Client host [xyz] blocked using b.barracudacentral.org' replies On Jan 21, 2016, at 8:46 AM, Lyle Giese <[email protected]<mailto:[email protected]>> wrote: It has been known that RBL's return a response to force the email admin to look and make appropriate changes in their configuration. Yeah. It doesn’t always work, though. If a RBL is part of a scoring scheme, mail often gets delivered anyway and the changes never get made. laura -- Having an Email Crisis? 800 823-9674 Laura Atkins Word to the Wise [email protected]<mailto:[email protected]> (650) 437-0741 Email Delivery Blog: http://wordtothewise.com/blog<https://na01.safelinks.protection.outlook.com/?url=http%3a%2f%2fwordtothewise.com%2fblog&data=01%7c01%7cmichael.wise%40microsoft.com%7c082c482296c642f472ed08d32286f517%7c72f988bf86f141af91ab2d7cd011db47%7c1&sdata=h3vU9YLIkaLkimtTUyusTxcG0RJsRMK%2fv%2bUYIkVkX3s%3d>
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