Wednesday, December 13, 2006, 2:39:41 PM, Steve wrote:
> I wonder whether a set of I-Mail rules that blocked all of the
> small island states with TLD's as well as Russia and Korea and
> anything else you wanted to include might not be effective. Assuming
> you host more than one domain, the rule base could be copied in by
> domain and modified if necessary for a domain that wanted to be able
> to receive the material. You could even take it to the user level if
> necessary. I've been playing with a few tests and have found it
> quite effective against new spam versions that the rule base has not
> yet encountered. It isn't at all effective against e-mail coming from
> an IP in Russia that masquerades with some other HELO or TLD but I'm
> surprised by how much of it is easily detected on that basis.
>
> It's also possible to block it out with huge IP blocks of course,
> as you can map them, but that is done for the I-Mail system as a whole
> so not easily implemented or tailored at the domain level.
There are DNSBL lists out there that allow you to block out specific
countries by IP address - no muss, no fuss, nothing to maintain. This
assumes your MTA supports DNSBL blocking of course. :-)
--
Joey Lindstrom
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