Personally, I find that spamdyke has very few false positives. In those
few cases, I whitelist the domain (as a temporary measure) and notify
the administrator of the offending domain that they have a problem. I
understand that this process may not work so well for ISPs though.
--
-Eric 'shubes'
And I'm not sure I'd classify that as a false positive... It someone's got
a screwed up DNS entry, no RDNS, or is blacklisted, that's not a false
positive. It may be unintended blocking, but it's not a false positive, at
least not in my mind.
I actually find (As an ISP) that blocking stuff has netted me more new
clients than cost me existing ones. Usually, the offending ISP/Hosting
provider doesn't respond to their clients complaints, and when I do, they
would rather do business with an ISP that is responsive to their clients
than with one that isn't...
I can usually give a pretty detailed reason why the e-mail was blocked,
explain how it's likely affecting their mail to other domains, and how the
issue is on their end. When they get "It's not on our end, it must be
someone else's problem" from their ISP, it's an easy sale. :-)
Mike
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