4 ms·

0.0 RCVD_IN_ZEN_BLOCKED_OPENDNS RBL: ADMINISTRATOR NOTICE: The query to zen.spamhaus.org was blocke

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/ https://nlnetlabs.nl/) is an excellent and easy-to-configure choice for solving this problem.

_dan 2y ago
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)
- daneel_w 2y ago
  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.
  - _dan 2y ago
    Oh sure, and their service is great and very much worth paying for.