Configure SMS subdomains sms-mms-subdomains
To be able to shorten URLs added to your SMS/MMS messages, you must set up the subdomain you will select when creating an SMS surface.
You can use a subdomain that is already delegated to Adobe, or you can configure another subdomain. Learn more on delegating subdomains to Adobe in this section.
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SMS subdomain configuration is shared between all environments. Therefore, any modification to a SMS subdomain also impacts other production sandboxes.
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To access and edit SMS subdomains, you must have the Manage SMS Subdomains permission on the production sandbox. Learn more about permissions in this section.
Use an existing subdomain sms-use-existing-subdomain
To use a subdomain that is already delegated to Adobe, follow the steps below.
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Browse to the Administration > Channels menu, and select SMS configuration > SMS subdomains.
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Click Set up subdomain.
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Select Use delegated subdomain from the Configuration type section.
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Enter the prefix that will display in your SMS URL.
note note NOTE Only alpha-numeric characters and hyphens are allowed. -
Select a delegated subdomain from the list.
note note NOTE You cannot select a subdomain that is already used as SMS subdomain. 
note caution CAUTION If you select a domain that was delegated to Adobe using the CNAME method, you must create the DNS record on your hosting platform. To generate the DNS record, the process is the same as when you configure a new SMS subdomain. Learn how in this section. -
Click Submit.
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Once submitted, the subdomain displays in the list with the Processing status. For more on subdomains’ statuses, refer to this section.
note note NOTE Before being able to use that subdomain to send messages, you must wait until Adobe performs the required checks, which can take up to 4 hours. -
Once the checks are successful, the subdomain gets the Success status. It is ready to be used to create SMS channel surfaces.
Configure a new subdomain sms-configure-new-subdomain
To configure a new subdomain, follow the steps below.
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Browse to the Administration > Channels menu, then select SMS configuration > SMS subdomains.
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Click Set up subdomain.
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Select Add your own domain from the Configuration type section.
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Specify the subdomain to delegate.
note caution CAUTION -
You cannot use an existing SMS subdomain.
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Capital letters are not allowed in subdomains.
Delegating an invalid subdomain to Adobe is not allowed. Make sure you enter a valid subdomain which is owned by your organization, such as marketing.yourcompany.com.
note note NOTE Multi-level subdomains (of the same parent domain) are supported. For example, you can use ‘sms.marketing.yourcompany.com’. -
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The record to be placed in your DNS servers displays. Copy this record, or download a CSV file, then navigate to your domain-hosting solution to generate the matching DNS record.
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Make sure that DNS record has been generated into your domain-hosting solution. If everything is configured properly, check the box “I confirm…”, then click Submit.
note note NOTE When you configure a new SMS subdomain, it will always point to a CNAME record. -
Once the subdomain delegation has been submitted, the subdomain displays in the list with the Processing status. For more on subdomains’ statuses, refer to this section.
Before using a subdomain to send SMS messages, you must wait until Adobe performs the required checks, which can take up to 4 hours. Once the checks are successful, the subdomain gets the Success status. It is ready to be used to create SMS channel surfaces.
Note that the subdomain will be marked as Failed if you fail to create the validation record on your hosting solution.