What are SMS Opt-Out Keywords?

Telnyx automatically processes incoming messages and recognizes English-language stop words. Stop words are specific words such as STOP or UNSUBSCRIBE that signal that a person no longer wishes to receive messages from you.

When Telnyx identifies a stop word, the person's phone number is added to the opt-out list and you will no longer be able to send messages to that number. Any further messages from your account that are sent to a number on the opt-out list will not be processed.

Please note that stop words are only recognized if they are the only words in the message. For example, "stop all" is recognized but "please stop all messages" would not be recognized.

Coming soon: You will soon be able to retrieve all phone numbers that are on the opt-out list.

Telnyx recognizes the following English-language stop words:

stop all

Telnyx will remove a number from the opt-out list if any of the following words are detected:


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