T-Mobile SMS/MMS Spam Filter

Let me start off by introducing myself. I’m a govt worker who has to forward monitoring system events from his email to phone SMS/MMS for easily heard and read notifications. I’ve been on ATT for the past 13 years where this has worked fine, but just changed to T-Mobile this past week where now I am receiving mostly undeliverable kickbacks to my mailbox, where it works sometimes but more than often not.

I called T-Mobile and they stated that they are decommissioning the @tmomail.net gateway, but has not introduced a new feature to allow mail to SMS to bypass or take the place of the original technology. I googled and found T Mobile has been saying this to customers since 2022, but yet the feature still exists. It almost seems like a go-to response on their script when they can’t find an answer or fix for the person’s complaint.

While on the phone with T-Mobile, the agent informed me they were not seeing drops on the spam filter and this is likely not spam related. However, after digging through the fine font from Microsoft Office365, it does indeed look spam filter related.  The email is reaching their TMO server and then being rejected by Cloudfilter.

Any suggestions for how I can request for this to be addressed? Sometimes I might need to receive just one notification and other times I might have a dozen all come in at the same time. All from Office365 (Microsoft) domain.