About the Exchange Administrator role
To help you administer Microsoft 365, you can assign users permissions to manage your organization's email and mailboxes from the Exchange admin center. You do this by assigning them to the Exchange Administrator role.
Here are some of the key tasks users can do when they're assigned to the Exchange Administrator role:
Set up an archive and deletion policy for mailboxes in your organization.
Set up mailbox features such as the mailbox sharing policy: how users can share calendar and contacts information with others outside of your organization.
Set up "Send as" and "Send on behalf" delegates for someone's mailbox. For example, an executive might want their assistant to have the ability to send mail on their behalf.
Create a shared mailbox so a group of people can monitor and send email from a common email address.
Email anti-spam protection and malware filters for the organization.
Manage Microsoft 365 groups
Exchange Online role groups
If you have a large organization, the Exchange admin might want to assign users to Exchange role groups. When an admin adds a user to a role group, the user gets permissions to perform certain business functions only members of that group can do.
For example, the Exchange admin might assign someone to the Discovery Management role group so they can perform searches of mailboxes for data that meets certain criteria. To learn more, see Permissions in Exchange Online and Manage Role Groups.