On 2/10/2021 5:24 AM, Ken O'Driscoll via mailop wrote:
IPv6 space is considered low quality from an email perspective, so the answer
is yes, receivers are likely to care about missing rDNS.
I'm interested in understanding the 'low quality' basis.
I don't have direct, hands-on for this. So my sense of the issue is
based on comments from those who do, within an anti-abuse group.
My impression from that has been a motivation to demand much stricter
behaviors -- not from demonstrated difference in traffic for v6,
compared with v4, but from a concern that IP-level analysis can't be
effective.
The much larger address space makes it too easy for a bad actor to jump
around and, therefore, not develop a bad reputation associated with the
address. So non-history features are made more strict.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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