"Have you yet even looked at the Why am I Blocked?"
Yes I have
"System has sent mail to SpamCop spam traps"
OK, I'm looking to solve that...It wasn't a trojan found on any machine (that I could find).
I can't detect any issue with our mailing program, but If you know somewhere to look for issues I will.
"..... Doesn't quite match up with that "10 times in the last year" description ...."
Actually it does, read the first sentence in the last 4 days... (12-11 is less than 4 days from 12-15)
"Real-time blacklists"
Yea I found these too, also pointed me to a trojan or malware. I ran MSRT as the CBL list reccommended, nothing found on any of the machines.
"Will wait for you to do some of your own research "
I did all this, You've told me nothing new, and none of this helped me resolve the issue