Hello!
I had some rejects of mail transferred to a system via IPv6 and the remote postmaster told me their rspamd reported the following:
ABUSE_SURBL(5.00){test:email;}, multi.surbl.org https://surbl.org/surbl-analysis IP 2a01:170:118f:3::22 can not be checked (!?) dorfdsl.de is NOT listed
Does surbl support querying IPv6 at all and are there situations where this can lead to an A record response (which will be interpreted as an IP listing)?