Q: My queries to a DNS-blocklist were blocked. (For example, a blocklist that returned a match for every single mail would 'catch all the spam', but would also mark every nonspam mail too.) Some of the above pages omit this information, so take with a pinch of salt. Note that it's extremely important to compare false positive rates (nonspam messages marked as spam), as well as spam hit-rates, when evaluating any anti-spam system, include DNS blocklists. Weekly Blacklist Statistics (including hit rate and false positive rate).Other places to find out about DNS blacklists / blocklists: Spamhaus Checking for spamvertized/phishing/malware/botnet/abused redirector sites.The following DNS checks are for URI's (eg http links). Sender Score Certified & Sender Score Safe List (formerly Ironport Bonded Sender & Habeas Safelist).DNSWL NOTE: DNSWL is enabled as a "free for most" provider.The following DNS checks are actually for WHITE lists, or sites which are certified by someone to be a reasonable sender. The top and bottom define their white and blacklists. Mailspike Mailspike has a reputation list of 10 different levels between a good and bad reputation. The following DNS checks have diverse levels of reputation:
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