header. In that list, we're performing the reverse DNS lookup, AND verifying the HELO/ELHO domain. These are the options I'm considering
I would turn OFF the HELO/ELHO tests as we saw lots of false Positives with that test.
We are happy with our IMail only Anti-Spam settings which you are free to copy any of our settings if you want. Here is a "flow-chart" and an explaination of what is done. I prepared this so that our users can understand the process.
http://www.summitinternetservices.com/tests.htm
While I have no reason to remove the Host Blacklisting (I've already proven that false positives are incredibly high from those five services), I just don't understand what value there is in the
The default DNSBL settings that Ipswitch supplied are horrible for False Positives. You can see on the above chart which tests (other DNSBL servers) we use and how many tests an email needs to fail. With these settings alone we never found a single False Positive and after many months of evaluation we decided to delete messages that failed at this level. That change resulted in a tremendous drop in the amount of spam we were getting. For example in a two week period we are having +40k emails move to the next level of testing but +29k are being deleted for failure at the DNSBL tests.
Now that I've finished digressing, I can say that you have answered my question, by suggesting methods to look for false positives in people who receive spam in quantity. The rest of my diatribe is perhaps useless, but it helps paint a picture of where we stand now.
Thanks for your reply! Eric
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