@dalias @ariadne The history of email DNSBLs is instructive; trust was established by maintaining evidence of abuse and following a consistent process of listing and delisting domains and address blocks. We didn't start out with trusted resources, what we had were ad hoc lists that reeked of petty squabbles and internicine fighting. Eventually a few people started behaving as adults, trust in the lists grew due to effectiveness (low false positive and false negative rates), and DNSBL operators either followed that evidence and process model or they fell out of use. What we have now reminds me of the early days of blocklists and petty grudge settling and infighting. Two things need to happen - lists need to be consistently and responsibly curated and they need to be easy to use. That implies a good distribution method.