Anyone shed light on Verizon blocking pop3 offnetwork?

I have a customer that left Verizon FIOS when he moved but kept his email address. About a month ago, he says his pop3 quit connecting. I've tested the ports he's using and notice they aren't responding. He's tried helpdesk and they sent him to the abuse whitelist. He tried the abuse@, which of course wouldn't be the correct location. Any recommendations? Jack