Hi Tew,
Please see if this addresses your issue:
http://forums.verizon.com/t5/Verizon-net-Email/Email-Account-Password-Lockout/m-p/744863
I am having exactly the same trouble.
Email through another network, (say, my home or work wifi) works correctly and I can send and receive messages.
However email when using the T-Mobile wireless network does not connect.
This is obviously not an activation issue. My account is not deactivated if I can send and receive messages using another network, so using the pin activation page is not the appropriate fix for this problem.
-Paul
I have the same problem, started a few days ago. Email service to phone only works with wifi, not with mobile data.