Starting a new thread, as many people are having this issue and posting to the following [Solved] thread without any help:
Recently, over the past few weeks, myself and many other T-Mobile users have been receiving spam SMS messages that have originated from EMAIL addresses. They seem to have been sent to our [Phone number]@TMOmail.net addresses, yet many of us have disabled this feature on our accounts/lines with no effect (i.e. enable “Block TMomail.net email") at https://www.t-mobile.com/support/plans-features/message-blocking
Some of us have found after examining the text message logs on their account that the messages show as coming from the short code “6245” (spells “MAIL" on a number pad), yet blocking this short code also has no effect on the incoming spam emails. Posted yesterday from T-Mobile community customer “Franzy" in the original old thread:
“...I finally logged in to my account and thought to check my incoming text logs. It shows that these messages are coming from 6245 (spells out MAIL and it sounds like it's a generic code used by web-based programs for IMing, Texts, etc)...Since these spam messages seem to be the only ones I can see coming from that number, I just blocked it...Ugh. I just got another one. So apparently that didn't work. I'll keep digging around for ideas.”
I just got off the phone with T-Mobile (1-800-937-8997), had the service rep escalate me to the tech support team, and the guy there was surprised that their Email to SMS service wasn't discontinued already. I informed him that the option to “Block TMomail.net email" is available to customers, but enabling the option has no effect. He was then able to confer with his supervisor and confirm that the block I turned on has been enabled since yesterday, but was surprised to learn that I still received another spam message today. I also explained that I can email my phone # at the address (##########@TMomail.net) any time, at will, from my Gmail account and get the text message seconds later, despite the block being in place. He will be digging into it and getting back to me...