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spam suggestion

I have a suggestion to augment the dns stuff. What do people think
of a rule like

	reject if target host's ns is xxx ?

Like, assume xxx is a spammer's front. It looks like that there will
be new sites yyy using xxx as ns before it is discovered that yyy is
also a spammer's front. If the assumption that no decent site will
use a spammer's front as ns, this might prevent some unknown spammer
sites from spamming.

Does this make sense or will it work?

Ambrose C. Li <acli@mingpaoxpress.com> Programmer-analyst (sysadmin)
Toronto EDP, Ming Pao Daily News +1(416)321-0088 1355 Huntingwood Dr
Scarborough ON Canada  M1S 3J1 [<- work ]
                                 [ home ->] <acli@acli.interlog.com>