Jeff Chan wrote:
if we wanted to block all spam we could list *
Works in both directions, if you wanted to white list sites with some potential "legitimate use" (and your last message indicated that this includes abusive scams), then you could white list *.
we have some good spam sources and we need to find ways to eliminate false positives.
You have collected some ways in the new listing policy. If you need more ways you could test the PR (it's probably not much better than Alexa, but you could test it with IE - sorry, I can't help you there, I've never implemented the hack to get a PR without IE, I only know that it exists ;-).
We are not trying to "find every spammer."
I know. But sometimes you're apparently trying to find every not-yet-spammer, and for obvious reasons both ways won't work.
we would have lists that were largely unusable.
Yes, there are too many domains to list them all. Just ignore dubious cases until they really show up somewhere. BLs without any FPs are IMHO technically impossible, unless they are empty.
Bye, Frank