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A comment on A Plan for Spam (2002). Parent comment

Re:A Plan for Spam (2002) by jorangreef on Tuesday February 19, 2019 @05:34AM (#19197998)
Have you tried using a quorum of DNSBL (e.g. barracudacentral.org, cbl.abuseat.org, truncate.gbudb.net) to reduce false positives?

In other words, if at least two DNSBL queries agree, then reject, or feed this information to the rest of the spam pipeline?

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Re:A Plan for Spam (2002) by thatsaguy on Thursday February 21, 2019 @06:41AM (#19216110)
This is pretty common, and systems like SA do this for you by batching responses and calculating a score.

I found this to be pretty much worthless if you already have greylisting, even for high-quality curated lists such as spamhaus SBL/XBL.

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