How sad that that TMO could not help you. You can also find all the setup instructions on the TMo website, but here are some details...assuming you have already setup your email accounts on the TMO website.

The pop/smtp servers are myemail.t-mobile.com. Your login and password are your phone number plus a number. For example, if you have two email accounts setup, one would be nnnnnnnnnn:1 and the other would be nnnnnnnnnn:2. The password is whatever you made it.

That is how to set it up using the TMO email. I find this works best since my accounts are not very happy to send mail using their smtp if I am not connected to them directly.

You can also setup accounts directly using their settings.

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Kyocera 6035, Kyocera 7135, Samsung i700, iPAQ 6315, iPAQ hx4705, Motorola a630, BB 7100t, iPAQ rx3115, JAM 850, BB 8700g, Samsung i320 (just for fun), imate KJAM, TMO SDA, MDA, TMO Wing