> If the industry had moved to a reputation model, it would be easier to 
> discuss "how bad is it" and whether it's bad enough to block at IP time, or 
> whether you mix it into your spam score.

Isn’t this what postscreen_dnsbl_sites is doing, for example?

> Will SMTP be the last hold-out on IPv4?

At dnswl.org <http://dnswl.org/>, IPv6 by volume was 0.06% over the past three 
days, and 1.34% of the netranges we list are IPv6. (Yes, that includes a lot of 
small-ish site which use our data and which may have lower adoption of IPv6 
than larger recipients.)

— Matthias

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