https://docs.customer.io/journeys/link-tracking-custom-domain/
Track links with your domain | Customer.io Docs
Trigger email, push, in-app, SMS, webhooks, and more with Customer.io. Gain control over behaviorial data to personalize customer communication and drive...
domain customer iotrack links
https://docs.customer.io/journeys/delete-domain/
Delete a domain | Customer.io Docs
domain customer iodeletedocs
https://docs.customer.io/journeys/authentication/
Domain Authentication | Customer.io Docs
You will need to add certain records to your DNS provider to allow Customer.io to send emails using your domain.
customer io docsdomain