On Sep 17, 2003, at 7:31 PM, Todd Holt wrote:
1. <x-tad-bigger>Can this filter distinguish between ADSL and SDSL? If not, is this acceptable?</x-tad-bigger>
2. <x-tad-bigger>Is the filter doing this?</x-tad-bigger>
3. <x-tad-bigger>Are there any unique instructions for doing this</x-tad-bigger>
88.224.57.208.in-addr.arpa. 604800 IN PTR las-DSL224-cust088.mpowercom.net
In the case of your mail.xidix.com, you would not fail that test because they made your PTR have DSL224- rather than -224- where it would have failed. I don't know if this was on purpose in Matthew's filter or not.
I do see benefit in giving some points to a PTR like yours just like I throw points at CHINA or BRAZIL when I actually do get legit mail from Brazil, but I find my legit Brazil email doesn't get enough points to be blocked, and sometimes throwing some points at Brazil can help to catch spam that would not be otherwise. By the same token I would not block DSL like yours, but I would give a couple of points simply to make the other tests more sensitive because then it would take less for you to hit my threshold. I have plenty of mail that has 5 or 6 points and is perfectly legit, and that's fine as long as legit mail doesn't get 50 or 60 points.
-Josh
