On Tue, Sep 26, 2023 at 11:12:53AM +1000, raf via Postfix-users wrote:
> Sadly, I need smtp_address_preference = ipv4 because some
> reputation systems (spamhaus, I think) don't realise
> that an entity might only have a single ipv6 address.
> They seem to think that everyone has at least 64 addresses.
> So, when an unrelated tenant near my VPS sent spam from their
> ipv6 address, it tainted my ipv6 address's reputation.
The choice is understandable, otherwise an spammer with a /64 or /56 can
switch to a new IP address every second and not run out until well after
the Sun is a red giant and the Earth is no more.
So if a single IPv6 address is all you have, sadly you do need good
neighbours.
--
Viktor.
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