If your monitoring woke you up today with all your servers blacklisted on a DNSBL, you can go back to sleep. Or actually don't, because you need to adjust your monitoring.
It seems that, since yesterday March 26th 2024, yet another DNSBL has disappeared from the Internet. The newest member of the "DNSBL gone offline" club is: spamtrap.drbl.drand.net.
If you're using Matteo Corti's check_rbl monitoring plugin, all your servers appear to be listed on that DNSBL:
In this case you need to adjust the list of DNSBL's which are checked; either by adjusting the -s parameter or by adjusting the config (ini) file.
mck@monitoring:~$ grep drand /usr/lib/nagios/plugins/rbl.ini
server=spamtrap.drbl.drand.net
Delete the entry (or comment it with a #) and the plugin stops checking this DNSBL.
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