All Amazon SMS messages sent via 10DLC number are blocked as spam

  • 2 September 2023
  • 0 replies


My app sends transactional sms messages via Amazon.

With the recent Long Code retirement looming, I created an Amazon Pinpoint 10DLC campaign and it got it approved. My 10DLC number went active on August 28th, 2023. So I switched to sending my app’s text messages via the 10DLC origination number. 

This worked great for other carriers. I’m seeing 0% spam filtering for them.

However, ALL messages I send through Amazon SMS to T-Mobile numbers are now being blocked as spam. These messages have only increased in their compliance as we had to update them to get the 10DLC campaign approved.


Do you have resources to help me resolve this myself or is there somebody I could work with to resolve this issue?


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