Anyone shed light on Verizon blocking pop3 offnetwork?

[Jack Bates]

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