Keywords are special words that can be used to opt-in or opt-out of messaging from your campaign. They are used to comply with the CTIA guidelines for SMS messaging. Sendo automatically handles the processing of these keywords, so you don’t have to worry about this. When a campaign is created, we set default keywords for STOP, START and HELP requests. You can change these keywords, and the message that is sent back to a contact in response, at any time from your campaign settings page.

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STOP keywords

When a contact sends a message containing the STOP keyword, they will be opted out of all future messages from your campaign. They will receive a confirmation message in response, which you can customize from your campaign settings page. All future message to this user will fail with a 1310 error code, unless that contact opts back in.
The STOP keyword cannot be removed, but additional variations can be added.
Default response: “NETWORK MSG: You will no longer receive messages from this number. Reply START to subscribe again.”

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START keywords

When a contact sends a message containing the START keyword, they will be opted back in to your campaign. They will receive a confirmation message in response, which you can modify from your campaign settings page. This keyword can be customized. Default response: “NETWORK MSG: You’ve subscribed to receive messages from this number. Reply STOP to unsubscribe.”

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HELP keywords

When a contact sends a message containing the HELP keyword, they will receive a message with instructions on how to opt-in or opt-out of your campaign. This keyword can be customized, and can be added to the response message. Default response: “NETWORK MSG: Text STOP to unsubscribe. Text START to reactivate your subscription if you have opted out.”