# Unsubscribe / Opt Out

This API allows you to retrieve all unsubscribed customers. 

An unsubscribed customer can be any of the 4 states below: 

### Mail Ban 

This applies to customers that are unsubscribed for both marketing and transactional purposes. 

No email will be sent by the CRM to a customer with mail\_ban. 

### Marketing Decline 

This applies to customers that no longer wish to receive marketing communication. 

Those customers can still receive transactional emails. 

### SMS Ban 

This applies to customers that are unsubscribed out for all SMS, for both marketing and transactional purposes. 

No SMS will be sent by the CRM to this customer. 

### Marketing Decline SMS 

This applies to customers that no longer wish to receive marketing SMS. 

Those customers can still receive transactional SMS.

#### Available in this API:

{% content-ref url="/pages/dJqCfRr8pMrkRllub059" %}
[Get unsubscribed customer](/experience-crm-api/mailing-list/unsubscribe-opt-out/get-unsubscribed-customer.md)
{% endcontent-ref %}

{% content-ref url="/pages/Hl1iwTIlqxJaw9KW8Zye" %}
[Unsubscribe a list of customers](/experience-crm-api/mailing-list/unsubscribe-opt-out/unsubscribe-a-list-of-customers.md)
{% endcontent-ref %}


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```
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```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.