Branded emails and domain names are connected in that the domain name is used as the address for the email. For example, if a business has a website at "www.acmeco.com" and wants to use branded emails, it might set up email addresses such as "info@acmeco.com" or "john.smith@acmeco.com." In this case, "acmeco.com" is the domain name, and it is being used as the address for the email.
Web servers and domain names are also connected in that the web server is used to host the website associated with the domain name. When a user types the domain name into their web browser, the web server retrieves the website associated with that domain name and sends it to the user's web browser.
Overall, branded emails, web servers, and domain names are all connected in that they all play a role in the operation of a website and the communication of a business or organization. The domain name is used as the address for the website and for branded emails, and the web server is used to host the website and make it accessible to users.