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

2003-09-08 11:49:05
At 1:09 PM -0400 2003/09/08, Chris Lewis wrote:

 H'm, t'would be amusing to try this out with a much-hacked DNS server
 doing the "sharing".  Create a query like
 "sender.ip.recipient.greylistzone", and let the DNS server do the
 counting.

Interesting indeed. Specifically with regards to the sample greylist implementation that is shipped in the latest snapshots of postfix, I was thinking about using a shared central MySQL database tied to a perl hash, or maybe a local proxy to a central program backed with a Berkeley db database tied to a perl hash.

On a more general level, I was also thinking about how you could implement something like this with a dynamic update to a DNS zone.

 I'm not the sender, only the recipient.  So, I couldn't be in
 violation of such a rule.

Anyone who retransmits within the thirty minute timeframe, for any reason, gets lambasted.

 This is something I mean to try on our huge spamtrap.  If only as a
 pure-research project...

        I look forward to hearing your results.

--
Brad Knowles, <brad(_dot_)knowles(_at_)skynet(_dot_)be>

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
    -Benjamin Franklin, Historical Review of Pennsylvania.

GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E-(---) W+++(--) N+
!w--- O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++) X++(+++) R+(+++)
tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h--- r---(+++)* z(+++)

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