Address Assignment Question

John Levine johnl at
Mon Jun 20 21:55:10 UTC 2011

> An organization that blocks 90% of spam with no false positives is
>incredibly useful.

>Using a greylisting system is equally effective without the black
> list part.

Hi.  I'm the guy who wrote the CEAS paper on greylisting.

Greylisting is useful, but anyone who thinks it's a substitute for
DNSBLs has never run a large mail system.


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