There are two types of domains you may come across when working in Adestra; authenticated domains and delegated domains.
Delegated domains are used within your campaigns for example as the domain in URLs for click tracking, and in automatically generated 'from' and 'reply' addresses.
Authenticated domains allow you to use your own domain in the 'from address' for your campaigns.
Both types of domains require a certain amount of configuration in Adestra and with your own third party DNS provider before they can be utilised within your account.