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skriefal t1_ja5o1zn wrote

These messages may be coming from an email > SMS gateway. For example, with T-Mobile you can send an email to [number]@tmomail.net and it'll be forwarded automatically via SMS/MMS to the specified 10-digit phone number.

With T-Mobile there is an option in the account settings to "Block TMOmail.net email." It's unclear whether this option works however - as there have been some reports claiming that it's broken. Other cellular providers may have a similar option.

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