Address Assignment Question

Jérôme Nicolle jerome at ceriz.fr
Mon Jun 20 17:16:22 CDT 2011


2011/6/20 John Levine <johnl at iecc.com>:
> Hi.  I'm the guy who wrote the CEAS paper on greylisting.

URL ?

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

You're right, greylisting on a large system may not be efficient as it
won't block everything and will eat-up quite a lot of system
ressources. But it's a good start once basic protocol-checks have
already eliminated the 80% amount of bullshit sent from botnets.

My point is : combining server-side checks of different nature is
often enough to avoid the use of RBLs and still provide a goode
quality of service. It probably won't scale to comcast' or AOL' MXs
but it's way better than relying on an external authority for your
corporate or personnal mailserver.

-- 
Jérôme Nicolle




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