1. Log into Exchange Admin Center.
First we need to log into the Exchange Admin Center.
2. Navigate to the Mail Flow >> Accepted Domain tab.
Then to create an Accepted Domain we need to navigate to the "Mail Flow" tab on the left hand side. Then we need to click on the "Accepted Domain" tab along the top.
3. Click the + "New" button.
To create a new Accepted Domain we need to click on the + "New" button.
4. Specify a display name, domain name and the accept domain type.
Specify a display name. Then in the "Accepted Domain" field, type the email domain you wish to accept and process email. Then specify the type of Accepted Domain. We picked "Authoritative".
5. Understand which Accepted Domain Type you need.
"Authoritative" is used when you own this name space and do not share it with anyone else and will be your choice in most cases. If you share a namespace between organizations, where mail users are split between two separate messaging systems, use the "Internal Relay" Domain. Any address that can't be resolved to an Exchange user is forwarded to the other system. An "External Relay" is when Exchange accepts the messages for another system and forwards ALL mail to it. It acts as an SMTP gateway.
6. Click Save.
Click the "Save" button to create the Accepted Domain.
7. To edit the Accepted Domain select it and click the Edit (pencil) button.
To edit the Accepted Domain select it and click the "Edit" (pencil) button. Click "Save" once you have made your changes.
8. To delete the Accepted Domain select it and click Remove (trashcan) button.
To delete the Accepted Domain select it and click the "Remove" (trashcan) button. Click "Yes" to Confirm.