Not receiving email from roadrunner.com address

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Version: 2008
Operating System: Mac OS X 10.5 (Leopard)
Email Client: pop

my friends email changed from adelphia.net to roadrunner.com. I do not get their messages now. I can send to them and they are received, but their replys are not received by me. When that person sends from another account, I receive the messages. I have no rules set to block roadrunner that I know of.
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