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Comment by daneel_w | Hacker News Reader

  0.0 RCVD_IN_ZEN_BLOCKED_OPENDNS RBL: ADMINISTRATOR NOTICE: The query to zen.spamhaus.org
                                                             was blocked due to usage of an
                                                             open resolver. ...

FYI: you'll need to run your own local resolver if you want to perform DNSBL queries with Spamhaus. Unbound (https://nlnetlabs.nl/) is an excellent and easy-to-configure choice for solving this problem.

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Even running your own local resolver, if you generate enough traffic they'll still block you. I think their definition of open relay is based on traffic volume.

(which is their right, of course - just a warning that might help someone not find this out at 4am like I did)

Yes, because Spamhaus is a commercial enterprise. My own experience with their "free tier" limit is that it's generous and sufficient for personal use.

Oh sure, and their service is great and very much worth paying for.

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