Reference
Custom tracking URLs and the Domains rename
Tracked links and open pixels can use a subdomain of your own domain. Sending Domains are now called Domains, and the API path is /v2/domains.
Updated Dec 20, 2025
NewOpen & click trackingSending domains
Add a CNAME record from go.yourdomain.com to go.emailitmail.com to serve tracking links from your own domain, or choose another subdomain with the domain’s tracking key.
Sending Domains are now called Domains in the dashboard, and the API endpoint /v2/sending-domains moved to /v2/domains. See Custom tracking domain.