I'm thinking that you might be referring to DYNAMIC???
If so, there are lots of false positives with this test, in fact I am only adding 2 points now myself, but doing so without any problems. There is a section for counterbalances in this if you would like to use a method similar to what Andrew suggested, however by design, it is properly hitting the Rogers IP space, both corporate and residential.
I've found that there are a lot of spammers that will use an IP'd reverse DNS entry from their hosting provider, such as above.net, and not applying a proper reverse DNS entry is highly indicative of spam, about 98% so from when I monitored this. This isn't exclusively targeted at zombies, it's also targeted at commercial IP space. I score it low because 98% accuracy is not so great, especially when such servers will also likely fail tests like HELOBOGUS when they false positive. I used to score this at 3 points but I dropped it a point because I really didn't need it, but of course how it fits in with another system is purely a matter of balance, and in some cases it won't be a good match.
Generally speaking, unless I can find a class of IP that is exclusively business oriented, common, and not likely to spam, I don't bother with making exceptions. If an exception could be made for commercial Rogers accounts though, I would probably add it in sice it doesn't appear like they do a lot of business with spammers, but of course their residential class IP's get hijacked just the same as all broadband providers.
Matt
John Tolmachoff (Lists) wrote:
Started using Matt's DynDNS test, so far so good. Only adding 3 so not too worried about FP.
However, noticed it catches legit from rogers.com.
Does any one know what their mail servers are so as to add them to the skip list for this test?
John Tolmachoff Engineer/Consultant/Owner eServices For You
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