email to sms not working from @tmomail.net and @messaging.sprintpcs.com

Hola,

My organization ocasionally uses email to SMS to send notifications to our customers. For the past few weeks our email-to-sms messages are not reaching clients. I have done testing on our side and the mail logs indicate that the email are sent to the tmobile server successfully without a block or a bounce back. but never reach the customer. This is leading me to believe that our domain may be getting filtered somewhere further down the line possibly?

Please if someone from the Tmobile engineering department can take a look at this, and please let me know any information you may need to troubleshoot.

Not sure what the correct avenue of contact is in this case, I was advised by phone support to post here. Please let me know. Thanks