Realtime Blocking Lists are actually a good idea for fighting spam. You register open relays or spammers and you can use them to block them well on mail servers. The downside: apparently such services are only run by sociopaths or alternatively complete technical idiots.
SORBS belongs to the latter category. Just enter the IP 62.153.201.130 (a server I administer). What problem does it throw out? High-port-FTP-server. So FTP servers on ports that deviate from the standard.
Great. What's unusual about that? Pretty much every Zope server has something like that (and the high-port FTP on 8021 is exactly that - a Zope). And the other two are simply private FTP servers for two users that happen to run on different ports because the main FTP server is on the same IP anyway...