timeouts
http://anticaptcha.net/
for sale
+ http://blacklist.lashback.com/
+ query zone: ubl.unsubscore.com
+ provider’s website https://lashback.com/ seems alive and active (news entries from 2023) but does not link to the blacklist
+ rsync URLs seem dead, so does the download url
00_NEEDS_RECHECK
https://antispam.imp.ch/
no usage policy
nbl.0spam.org Network Black List | Spam Source Networks, high volume of spam trap hits in a Class C block will result in network listings in this DNSBL.
url.0spam.org URL Black List | This list contains the IP address of domains found to be in the source of spam emails found in our traps.
return codes not very clear
- http://blacklist.lashback.com/
- http://ubl.unsubscore.com
http://blacklist.woody.ch/rblcheck.php3
http://cbl.abuseat.org/
http://dnsbl.burnt-tech.com/