I have a BB with that is linked to a BES account with Vodafone. Additionally i have two other emails setup on it, POP accounts. Now the BES part of it works with no problems, however, the two POP accounts come back with "Message Blocked" error when trying to send/receive emails.
The BES part of the blackberry is with a hosted exchange enviroment, a 3rd party, and doesnt have anything to do with the POP accounts. So id imagine that the routing of the POP stuff is not related to the IT Policy on the Blackberry.
So, if you will, imagine that you have a work BB and your work email is sync with your work BES exchange, but then you have youre personal emails setup as POP accounts on the BB.