AOL Blocked?

Hi, I have two customers who cannot send messages to AOL. No information comes back to my customers that the message is blocked, seems like it gets to the AOL servers and AOL just dumps it. The mail server they are both on is Murdock. I haven’t sent in a support request…yet. Just wondering if anyone else on Murdock can send to AOL. Or, it could be just these two clients? Does anyone know where I can go look to see (on AOL) if they have been blocked…googling got me nowhere.