Hai!
How about just cvent.com? I've uploaded the headers from one FP here: http://pastebin.com/UDuDcp4F
How would another RBL handle a company that I have personally received evidence of spamming even if it causes FPs?
Apparently none of the other RBLs consider it spam.
Apparently other RBL's care more about colleteral damage. I would not list this. You would not list microsoft.com neither if you accidently get a spam that you feel itnt appropriate. This is harming more then it does good. But its your list so your rules ;) I would not want to use it to filter my mails with it but hey ;)
That's because you don't do business with them, so anything received is unsolicited. In my case, corporate communications are actually being blocked. I'm going to keep a closer eye on them, and manually inspect more of their mail to figure out what to do next.
That telling it all ... Bye, Raymond.