Bright House Networks - Legacy → Cannot send mail to cfl.rr. com recipients

We have Roadrunner Service in the Orlando area for our business and have had a consistent issue with the ability to send e-mails to cfl.rr.com addresses.
When I look at them in our Exchange Queues they are getting hung up and unable to be delivered. I have verified our IP using MXtoolbox lookup and we are not on any blacklists.
I tried support but they were not able to be much help.
As this is the only domain we have issues with I'm thinking they may have us on a blacklist they verify against.

We are aware of the issue and it is being worked. No ETA on a resolution at the moment.