sending text to my cell phone using @tmomail.net no longer working?

I see that several people have opened trouble tickets, but I’m unclear on exactly what the fix was as I have now opened 3 tickets with T-Mobile and I’m getting various answers.

The first answer is that email to text support has been discontinued, but I pushed the further and asked how they could be the only carrier that doesn't support this and there must be a work around.  I was now told they would escalate but to allow 4 days for a response.

I’m asking specifically of those that got it fixed, “What can I tell the rep to do on the T-Mobile side”, do they have to open up specific domains that I can receive email to text from?  

Everything I tell the rep is above their pay grade.

Gracias,