+ http://www.blocklist.de/en/index.html
+ lots of timeouts as of 2023
+ forum link is dead, among others
+ seems unmaintained but alive
+ latest news is from 2016
+ latest blog entry from 2022
+ Abusix, a network security company for mail security and abuse report handling, takes over blocklist.de to integrate it within its Abusix platform to further improve its data quality.
+ http://www.emailbasura.org/cgi-bin/emailbasura-ini.pl?lang=eng
+ placeholder/parked?
+ http://www.leadmon.net/spamguard/
+ website times out
+ http://www.srntools.com/blacklist/
+ redirects to comodo.com subdomain where I can’t find any information about a DNSBL
+ https://bl.konstant.no/
+ https://docs.hetrixtools.com/bl-konstant-no-unresponsive-removed/
+ [July 29, 2022] This RBL has become unresponsive, and we’ve removed it from our system until it returns to functioning normally again.
+ https://www.megarbl.net/
+ connection times out
+ https://www.blalert.com/dnsbl/rbl.megarbl.net
+ »This blacklist is marked as inactive and is not being checked at the moment. We will be tracking it to see if it goes to normal again.«