misunderstanding scale, SMTP edition

John Levine johnl at iecc.com
Wed Mar 26 17:09:06 UTC 2014

>OTOH, a spammer with a single /64, pretty much the absolute minimum IPv6 block, has more than 18 quintillion addresses
>and there’s not a computer on the planet with enough memory (or probably not even enough disk space) to store that
>block list.
>Sometimes scale is everything. host-based reputation lists scale easily to 3.2 billion host addresses. IPv6, not so easily.

Quite right.  If I were a spammer or an ESP who wanted to listwash, I
could easily use a different IP addres for every single message I sent.


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