RE: [Asrg] 7. Best Practices - DNSBLs - Article

[Jason Steiner <jason@emptyexistence.com>]

"Yakov Shafranovich" <research@solidmatrix.com>
> 
> I am not suggesting that a consent system should use ALL available 
> sources, just more then one. Two DNSRBLs or a DNSRBL combined 
> with a filter might be better than relying on SPEWS.org or some other 
> DNSRBL as a sole source of information. Decisions on spam should 
> not be based on a single source alone.

Why? If that single source is reliable and does a good job of implementing
the policies I choose for my mail servers (eg. "We don't want mail from 
dialups here.") , what is the point of incurring the extra load of querying 
more than one, especially if the second is going to be much more resource 
intensive? (eg. A content filter behind a DNSBL.)

jason

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