- Navigate to the Admin Center > Exchange screen
- Go to the mail flow => accepted domains option
- Give a suitable Name (the image below shows the sample domain name mithiconnectxf.org)
- Enter your domain in the Accepted Domains list. (The image below shows the configuration for domain mithiconnectxf.org. Substitute with your domain name.)
- Choose the Internal Relay option
- Select the Accept mails for all subdomains option
- Save the accepted domains list