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Re: [ietf-dkim] New issue: Upward query vs. wildcard publication

2007-04-18 17:11:17
Mark Delany wrote:
John L wrote:
percentages are "normal" vs. "unusual", but my cursory look a
long time ago suggested that it met the 80-20 rule.

You are certainly correct that most zones are pretty flat, but this
sounds like a DOS attack waiting to happen, send out junk with long
bogus addresses

I'm just raising this as a discussion point; what if we said that the SSP record must (at least) exist at the registry cut-point?

It's not particularly pretty, but you (only) need about a 1,000 entry database to define all the registry cut-points today. I know the size because we've built this sort of database for other reasons. I think SpamAssassin has something similar as well.

FWIW, here's what we use for cut points:

http://svn.apache.org/viewvc/spamassassin/trunk/lib/Mail/SpamAssassin/Util/RegistrarBoundaries.pm?view=co

surbl.org and uribl.com use the same cut points since they're mostly used by SA.


Daryl
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