Today if I feed these IP addresses into www.dnsstuff.com, they now fail multiple tests that I have enabled (SPAMCOP, CBL for example). ... The only explanation I can come up with is that they were just added to the lists. Is this reasonable? Are there other explanations? Can I find out when they were added to any of the lists they now fail?
That is probably what happened. Spamcop used to list when the IPs had been added, which was a really nice feature, but now they are very vague ("Listed 18 of the past 21 days", for example), which doesn't help much. Most other spam databases do not, however, list when the IPs were added.
-Scott
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