Verizon uses "sender verification". Office this bounces legitimate email. Many non-US email systems are not implementing the protocol(s) needed for sender verification therefore, effectively, those non-US email servers are blocked.
Verizon's implementation of sender verification has been flawed since its initial implementation. They have mistakenly blocked legitimate email from the .GOV and .MIL Domains !
I apologize for my poor wording in the referral message. Verizon is blocking e-mail, not websites. What Verizon has been doing for the past few weeks is blocking e-mail originating from all/most/many? continental European (.uk seems to get through) and Asian servers. This is apparently done by IP address and is a new problem, separate from the Sender Verification thing that they have been doing for the past year and a half. They have not made any mention of this policy change on their website (and BTW, they have also removed the Sender Verification announcement on their site as well), so it is not clear exactly what they are blocking, but some people have reported that none of their mail is getting through from anywhere on continental Europe, and Verizon tech support admits that they are deliberately blocking the mail, but refuses to do anything about it.
David, That is a pretty nasty response. Why should we not initially trust this person? In any case, I will give him my address, and ask him for more information. If he gives it to me I will post his message on the verizon boards.