Problem emailing verizon users

[Chaspo]

I've used Windows Mail under Vista successfully for several years. Now, in
the last 2-3 months, people with verizon.net email addresses no longer
receive my emails. Everyone else does. I can receieve their email, however.
Can anyone help with this?

 

[Steve Cochran]

What happens when you reply to a received message? Does it never get there?
Do you get a rejection message? Did the recipient check the server side
spam filters?

steve