Every anti-spam filter uses DNS-based Blacklist (DNSBL) servers. BL-Monitor is a free visual tool that performs simultaneous timing on several DNSBL servers, and measures their effectiveness. Using this information to eliminate slow and less-effective DNSBL servers your email filter can become more efficient and responsive in its email handling. New for v2 is the ability to check for accidental blacklisting of a local mail server, performed automatically up to 6 times daily. Alerts have also been added for certain DNSBL server conditions such as the catastrophic blacklisting of the entire Internet. An optional upgrade to the PRO edition adds a best combination and IP overlap analyses, and supplemental email notification.
Version 2 automatically checks local mail server for blacklisting by DNSBL servers, up to 6 times daily. New alerts when certain DNSBL server conditions are detect.
Limitations:
500 IP addresses, 1-local mail server trial
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