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MSG-SMS-STOPDeterministiclegally required
Campaign messaging honours opt-out keywords
What the source requires
Recipients must be able to revoke consent, and the statute carries a private right of action.
Why this is hard to satisfy
Campaigns are sent from tools that do not enforce keyword handling, and the exposure is per message.
What we do about it
Pre-send gate. A campaign that cannot demonstrate opt-out handling does not send.
In build · phase two
What this tier means
Same input, same verdict, every time — no model in the loop. This is the only tier where the word “verified” is literally true.