Custom subdomain for shortened links

Link shortening lets you create short links that are easier to share in messages. Additionally, it opens up a possibility to personalize links by using your own subdomain, which makes the link appear even more trustworthy and professional. Shortened links with your own subdomain enable you to add an opt-out link to a text message or to send links to a website that contains a personalized list of items.

When you use the link shortening feature, the default domain of the short link is In this article, you will learn how to configure link shortening to use your own subdomain, which is recognizable to customers.

  • During this configuration, you will need to contact the Synerise Support team.
  • The shortened links don’t require HTTPS. If you include a link with http:// in the message, it will be redirected to HTTPS when opened.

Existing campaigns don’t need to be updated after the domain changes, their messages will be sent with the new domain.

  1. In your hosting, create a subdomain for Synerise URL shortening, for example
    Important: Only a subdomain can be used. Root domains aren’t supported.
  2. Configure a CNAME DNS entry for the created subdomain:
    // For Azure Cloud deployments:
    NAME                        TYPE   VALUE
    --------------------------------------------------        CNAME
    // For Google Cloud Platform deployments (currently only available in Belgium):
    NAME                    TYPE   VALUE
    --------------------------------------------------        CNAME
    Note: After creating a DNS entry, you may need to wait 24-72 hours before it becomes active.
  3. Contact Synerise Support and provide the subdomain name.
    Synerise Support updates the configuration of the workspace with the subdomain.
  4. If you want to use your own certificate:
    1. Prepare an X.509-format certificate.
    2. Deliver the public key as a .pem file to Synerise Support.
      Important: When you use your own certificate, it is your responsibility to monitor its expiration time and re-generate it.
  5. If you want Synerise Support to provide a certificate for you:
    1. Contact Synerise Support to request the certificate.
      Synerise Support generates a certificate by using third-party solutions such as
    2. If your domain has CAA records, add the following record to the root domain or subdomains used with Synerise: IN CAA 0 issue “”
      Important: If your subdomain does not use CAA records, you do not have to add them.

Result: The shortened links change from the Synerise domain to your subdomain. Existing campaigns don’t need to be updated.


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Thank you for helping improve out documentation. If you need help or have any questions, please consider contacting support.

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