response codes according to their reputation, both positive and negative
listing policy documented
usage policy documented
- http://www.isipp.com/email-accreditation/iadb-query-instruction/
- requires signup
- not quite a usage policy, but seems ok
- strange split of ipv4 and ipv6
- seems dead?
+ https://www.isipp.com/for-isps/iadb-query/
+ usage policy seems clear: It is free to query all of the IADB, IADB2, and WADB.
+ not quite a whitelist but closer to whitelist than blacklist
+ listing policy seems to be: get certified by them (for a fee) https://www.isipp.com/email-accreditation/faq/#pricing
+ response codes are documented