return codes are explained
http://rfc-clueless.org/
usage policy is not so clear but the FAQ implies that it’s just free to use for everyone
- http://spameatingmonkey.com/lists.html
+ http://spameatingmonkey.com/
+ lists IPs
+ lists domains
+ usage policy seems clear
+ https://spameatingmonkey.com/faq/query-limits
+ listing policy seems clear
+ https://spameatingmonkey.com/services
+ return codes documented
+ https://spameatingmonkey.com/services
http://uribl.com/
http://wiki.junkemailfilter.com/index.php/Spam_DNS_Lists
http://www.rbl.jp/allrbl-e.html
http://relaytest.kundenserver.de/
http://rv-soft.info/
http://spamcannibal.org/dnsbl_check.shtml
- http://spameatingmonkey.com/lists.html
http://spamrats.com/
http://spamstinks.com/
http://st.technovision.dk/