This is clever but due to the astounding amounts of spam and scams I got through that mechanism (not this script specifically), I had to set this to blocked on my T-Mobile account.
I wasn't aware you could block email-based messages. I did a quick online search, but didn't find any T-mobile documentation for this. Do you when're I can learn more about it?
I recently did exactly the same. Sadly, the local library system uses these gateways, but that's a sacrifice I was willing to make to cut out a ridiculous amount of spam.