Once tracking domain is configured, Aritic Mail will automatically scan your outgoing messages and replace any links with a tracking link that goes via Aritic Mail. When the link is clicked, Aritic Mail will log the click and redirect to the user to the original URL automatically. The links that are included in the e-mail should be on the same domain as the sender and therefore you need to configure a subdomain like track.yourdomain.com and point it to your mail.ariticmail.com.