The video is in Georgian, but it is useful to see it visually. You can find similar videos on YouTube.
After placing the site on a specific domain, it is necessary to create domain-specific emails from the very beginning. For example, if your site's domain is finddomain.ge, then it is logical that your corporate emails will be: info@ finddomain.ge; contact@ finddomain.ge, saxeligvari@ finddomain.ge; etc. This is your choice. You choose the email name yourself, which is located in front of the ... @ symbol. The final created email address is accessed via the following link: https://yourdomain:2096
This option is available in your site's hosting cPanel and everyone can do it. I will show you everything visually: