# Opt-out lists in AWS End User Messaging SMS
<a name="opt-out-list"></a>

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.

If a phone number is in the opt-out list then the message is not sent, regardless if there is an [override to allow](protect-rule-override.md#protect-rule-override.title) the phone number to receive messages. The phone number has to be removed from the opt-out list for it start receiving messages again.

By default, opt-outs are managed by AWS automatically. You can choose to disable this automatic opt-out handling by enabling self-managed opt-outs. Your account can contain both numbers for which opt-outs are managed by AWS, and numbers for which you manage opt-outs yourself.

**Topics**
+ [Required opt-out list keywords](opt-out-list-keywords.md)
+ [Self managed opt-outs](opt-out-list-self-managed.md)
+ [Set up self managed opt-outs](opt-out-list-managed.md)
+ [Create an opt-out list](opt-out-list-create.md)
+ [View origination identities](opt-out-list-originators.md)
+ [View the details of an opt-out list](opt-out-list-view.md)
+ [Add a destination phone number to an opt-out list](opt-out-list-add-phone-number.md)
+ [Search for a destination phone number](opt-out-list-search.md)
+ [Remove a destination phone number](opt-out-list-remove-phone-number.md)
+ [Delete an opt-out list](opt-out-list-delete.md)
+ [Manage tags for an opt-out list](opt-out-list-tags.md)
+ [List shared opt-out lists](opt-out-list-shared.md)