On Wed, 10 Feb 2021, Dave Crocker via mailop wrote:
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.
My recollection is that when IPv6 mail services started being available
the received wisdom here was that any IPv6 blocks (this was before
talk of reputation was common) should be at the /64 level (cf /32 in
IPv4) on the assumption that ISPs would give each end user a /64.
Is that still reasonable advice, if you *are* blocking or scoring
IPv6 addresses (presumably as well as domain/host names) ?
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.uk
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