Email to text gateway is rejecting messages with 550 blocked error


For the past 3 months, messages sent to are being rejected and returned with a message like this:

550 permanent failure for one or more recipients (

I work for a hospital and we used Google as our e-mail service to send out alerts and notifications to staff. Messages sent to tmomail are being blocked.

I have contacted t-mobile support by phone multiple times but the staff answering the phone are not able to address the problem, and only focus on a single phone number.  Reading other similar posts here, I see that somehow you have to call in and get added to a 'approved sender' list.  Can somebody tell me what number to call for support that would understand this issue?



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