Opt-Out lists
An opt-out list is list of destination phone numbers that should not have messages sent to them. When you send SMS messages, destination identities are automatically added to the opt-out list if they reply to your originator phone number with the keyword STOP (unless you enable the self-managed opt-out option). If you attempt to send a message to a destination number that is on an opt-out list, and the opt-out list is associated with the phone number used to send the message, AWS End User Messaging SMS doesn't attempt to send the message.
Opt-out list keywords
Where required by local laws and regulations (such as in the US and Canada), SMS and MMS recipients can use their devices to opt out by replying to the message with any of the following:
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ARRET
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CANCEL
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END
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OPT-OUT
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OPTOUT
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QUIT
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REMOVE
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STOP
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TD
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UNSUBSCRIBE
To opt out, the recipient must reply to the same long code or short code that AWS End User Messaging SMS used to deliver the message. After opting out, the recipient no longer receives SMS or MMS messages from your AWS account.
Note
For US toll-free numbers, opt-outs are managed at the carrier level. The only supported opt-out keyword for a US toll-free number is STOP. You can't add additional opt-out keywords, or change the response message that your recipients get when they opt-out.
