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Add a Custom SSL Configuration

If you do not want to use Content Delivery Networks (CDNs) when setting up a Secure Sockets Layer (SSL) for click and open tracking, you can set up a custom SSL configuration.

Before adding a custom SSL configuration, you need to set up link branding on your account.

To add a custom SSL configuration:

  1. Prepare a proxy to receive all inbound traffic at your link branded domain and forward it to or
  2. Configure the proxy to use HTTP or HTTPS.
    • For HTTPS, you must provide your proxy with a valid SSL certificate for your link branded domain.
  3. To forward traffic from an inbound email, you will need to set the Host HTTP header(link takes you to an external page) with your link branded domain.
  4. Point the CNAME record at your hosting provider to your proxy. For example, CNAME .


Do NOT validate the DNS record more than once. After changing the CNAME a second time, the second validation attempt will fail, and the authentication will stop working.

Contact Twilio SendGrid Support(link takes you to an external page) to enable SSL click and open tracking.


troubleshooting page anchor

When adding a custom SSL configuration, you may run into errors. The section below will help you troubleshoot some of the most common issues customers encounter.

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