Matt Sergeant wrote:
Some mail systems are unable to differentiate between these various
results or flags, however, so a public DNSBL MUST NOT include
opposing or widely different meanings -- such as 127.0.0.23 for
"sends good mail" and 127.0.0.99 for "sends bad mail" -- within the
same DNS zone.
Not sure why this is a MUST NOT. If people are dumb enough to use a
mixed list in a broken way they get what they deserve. What's the
This isn't just broken lists it's broken software. Not all software
which uses DNSBL's differentiates by returned response.
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