Yes, Pepipost replaces all of your links for the tracking of clicks. But on click they are actually redirected to your original links only. On click, these links are visible only for fraction of second and later it will get redirected to your original link. In case you do not wish to have the default Pepipost links in your emails you can follow this link to whitelabel the tracking link. Once you have done the settings as mentioned, the custom URL will be set for your domain.