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Configure SMS subdomains sms-mms-subdomains

Last update: Wed Jun 18 2025 00:00:00 GMT+0000 (Coordinated Universal Time)

CREATED FOR:

  • Intermediate
  • Admin

Get started with SMS subdomains gs-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 configuration.

You can either use a subdomain that is already delegated to ÃÛ¶¹ÊÓƵ, or configure another subdomain. Learn more about delegating subdomains to ÃÛ¶¹ÊÓƵ in this section.

SMS subdomain configuration is shared between all environments. Therefore, any modification to a SMS subdomain also impacts other production sandboxes.

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 ÃÛ¶¹ÊÓƵ, follow the steps below.

  1. Browse to the Administration > Channels menu, and select SMS settings > SMS subdomains.

  2. Click Set up subdomain.

  3. Select Use delegated subdomain from the Configuration type section.

  4. Enter the prefix that will display in your SMS URL.

    Only alpha-numeric characters and hyphens are allowed.

    note caution
    CAUTION
    Do not use cdn or data prefixes as these are reserved for internal use. Other restricted or reserved prefixes such as dmarc or spf should also be avoided.

  5. Select a delegated subdomain from the list.

    You cannot select a subdomain that is already used as SMS subdomain.

    note caution
    CAUTION
    If you select a domain that was delegated to ÃÛ¶¹ÊÓƵ 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.

  6. Click Submit.

  7. Once submitted, the subdomain displays in the list with the Processing status. For more on subdomains’ statuses, refer to this section.

    Before being able to use that subdomain to send messages, you must wait until ÃÛ¶¹ÊÓƵ performs the required checks, which can take up to 4 hours.

  8. Once the checks are successful, the subdomain gets the Success status. It is ready to be used to create SMS channel configurations.

Configure a new subdomain sms-configure-new-subdomain

To configure a new subdomain, follow the steps below.

  1. Browse to the Administration > Channels menu, then select SMS settings > SMS subdomains.

  2. Click Set up subdomain.

  3. Select Add your own domain from the Configuration type section.