Un domaine, trois réglages : site, app, emails
When you buy your own domain for an app, three settings are made right away: the site that explains the product on the main domain and the app on a subdomain, built separately; two sending subdomains for email, one for the app’s messages, one for marketing; and a sitemap declared to Google. The principle is the same for the first two: what changes often and what must never go down do not share an address.