Email to SMS via @tmomail.net Not Working

Según this answer, use of certain words in the message can trigger SPAM-filtering (which this looks like).

In that answer, @HeavenM , Community Manager, says:

… Are you sending these messages from your personal email address or from an automated email service? Does the email that you are sending from include words like admin, info, alert, test, contactus, or sales? (This is not a complete list of words in the email address that are filtered but gives you an idea.) The tmomail.net message route is not designed for ANY business messages …

Asimismo, esta página defines "Consumer" vs "Non-Consumer" messages. It seems backwards, but "Consumer" messages are the ones people send to themselves or their friends, like right from your phone. "Non-Consumer" messages are the ones businesses send, such as when you get an authentication code from your bank or a reminder from your scouting organization, etc - anything that's sending for a business or organizational purpose. "Non-Consumer" messages have to be set up with TMO or a messaging service.

Beyond that, regular tmomail.net messages are supposed to work as long as they don’t meet the SPAM criteria.