Best service/tool for Blacklist monitoring

Can anyone recommend the best blacklist monitoring service/tool for alerting when an Exchange site or IP gets blacklisted publicly?
GCTTechsAsked:
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billfusionConnect With a Mentor Commented:
mxtoolbox offers those services including a free option:

http://mxtoolbox.com/services_servermonitoring2.aspx
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GCTTechsAuthor Commented:
This is what I was using. The paid for version is cheap and definitely the way to go.
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