Start a Flow after Receiving a Message that Doesn’t Match Any Keywords

Use this trigger to launch a flow when you receive an uncaught message—i.e., a message that isn’t handled by any existing flows or triggers. This is often called a “catch-all” trigger because it can route unmatched messages to any flow you choose.
Create a catch-all trigger:
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Open the Triggers tab and click New Trigger.
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Select Start a flow after receiving a message that doesn’t match any keywords.
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Pick the flow to start and, if desired, specify the channel it should apply to and any groups to include or exclude.
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Save to add the trigger.
Example:
If an incoming message on your Twilio channel fails to match any keyword triggers, your Registration flow will start automatically. In your active triggers list, you’ll see this catch-all entry targeting Twilio and launching Registration.