Email to text not working for the T-Mobile SMS Gateway

We are using email-to-text to send form notifications via text message by way of the carrier's SMS gateway. Verizon: @vtext.com, AT&T: @txt.att.com and T-Mobile: @tmomail.net. Verizon and AT&T are working great. But I cannot get one T-Mobile phone to accept a SMS email from Jotform.

At first, I thought it might be because the T-Mobile phone I was trying to send to was a work phone, where the line and the device are managed by the company. But the message was also not sending to a private T-Mobile phone number either.

I thought it must be a problem with T-Mobile since Verizon and AT&T were working, but if I send a message from my Gmail account to either T-Mobile number I have (work phone and non-work phone) they both go through. So the number is correct and the gateway domain is correct and both numbers send SMS emails if they don't come from Jotform.

I made sure the message was below 160 characters. Then I made sure the message was below 120 characters. I looked on T-Mobile's help forum where one user said the message actually has to be over 160 characters so it forces the message to be sent via MMS rather than SMS. Well, the size doesn't seem to matter. Another user suggested adding a 1 to the beginning of the number. Another suggested adding a +1 to the number. Another suggested saving the sender name and email as a contact in the phone. None of these things have helped.

I tried setting the message up both as a Notification Email and an Autoresponder Email and that didn't make a difference. I've taken out all the HTML from the email so it's simply just text and no dice. I took out any of the form fields like {name} from the message and still nothing. I verified an email address so the sender doesn't show up as noreply@jotform.com. Nothing has worked.

One thing I thought of doing as a workaround was to send the Jotform notification to a Gmail account and then set up a filtered forwarding rule to auto-forward any of those specific messages to the T-Mobile number I'm trying to send to. I received a mailer daemon in return to the forwarding Gmail account, saying the message was blocked due to a 550 failure error for "banned content". I noticed in the text file attached to that email that noreply@jotform.com is referenced a few times. Maybe that is the issue.

Does establishing SMTP credentials remove noreply@jotform? The Verified email way doesn't seem to do that.

Have you heard of this issue specifically with T-Mobile before? Is there anything else you can think of I can try?

We would like to apologize for any inconvenience. Perhaps the information in this other thread will help you solve your concern — https://www.jotform.com/answers/1434385

As for your question — "Does establishing SMTP credentials remove noreply@jotform?", when you set up SMTP in your JotForm account and use it as the Sender Email of the email notification/autoresponder in your form, the email alert will be sent from the server of the SMTP you set up and not from JotForm's server. However, for the verified email, the email will still come from JotForm but it will just appear in the email sent that the email came from the verified email you set up.

I would suggest that you try using SMTP to see if that helps.

How-to-Setup-SMTP-for-a-Form

How-to-use-your-Gmail-account-as-your-email-sender-via-SMTP

If the issue you are having is still not solved after using SMTP, please let us know.

Please let us know also the form you are working on and the email notification in that form that you are trying to forward to a T-Mobile phone number.