It’s mostly IPv4. The volume over v6 isn’t there. Blocking via IP on V6 is trick... | Hacker News

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		gwittel on Jan 31, 2020 \| parent \| context \| favorite \| on: Tell HN: Mailgun lowers free-tier API from 10k to ... It’s mostly IPv4. The volume over v6 isn’t there. Blocking via IP on V6 is tricky since it’s not clear what a safe/useful block range would be.

cx42net on Feb 3, 2020 [–]

You are right, most VPS provider for instance, don't give just one IPv6, but a full range. One might be able to implement a spamming server with rotating IPv6.

Spamhaus has released a "blocking strategy" for IPv6 to exactly address this issue: https://www.spamhaus.org/news/article/668/spamhaus-releases-...

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