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

magenta, 

what happens if you send to your number from a different email account?

In my case if I send from a different account it does go through.

ph#@tmomail.net from my gmail.com is like it never happened, from my swbell.net email account gets through fine.

Try it if you can. If yours also works from a different Email it provides more evidence that is is some kind of SPAM filter run amok, solution is simple, add a whitelist of email accounts we want Email to mms messages from, all other can be regarded as SPAM in my case.