Microsoft 365 - Manage Full Mailbox, Send As, and Send on Behalf of Permissions
Important:
- Administrative access: Permission to administer another account is required before access is available.
- Administrator - NetID: Request access and manage a NetID
- Administrator - Shared Mailbox, Service, or resource account: Request Group for Administrative Access
- End user: Grant administrative access to your NetID
- UW–Madison Microsoft 365 accounts only: Permissions only work between UW–Madison Microsoft 365 accounts. They cannot be assigned to external accounts (e.g., UW Health, Gmail, Yahoo).
- Send As takes priority: If both Send As and Send on Behalf are granted, Send As takes priority.
Permission Types
|
Permission |
What It Allows |
Example |
|
Full Mailbox |
Read, delete, create drafts, send calendar invites, create events. Cannot send emails. |
You can open and organize emails in another user’s mailbox, but you cannot send messages from it. |
|
Send As |
Send emails as the mailbox owner. The “From” address shows the owner’s name. |
You send an email from help@domain.wisc.edu, and recipients see it as coming directly from that address. |
|
Send on Behalf |
Send emails on behalf of the owner. The “From” address shows “on behalf of.” |
You send an email from help@domain.wisc.edu, and recipients see: “Bucky Badger on behalf of help@domain.wisc.edu.” |
Manage Mailbox Permissions for a NetID, Service Account, or Shared Mailbox
Account Permissions Page
The permissions page lets you add, remove, or fix a user’s mailbox permissions for a NetID, service account, or shared mailbox.
- Permissions: Shows users who have full mailbox, send as, or send on-behalf of permissions.
- Grant Permissions: Assigns full mailbox, send as, or send on-behalf of permissions.
- Validate Mailbox Permissions: Verifies and fixes a user’s mailbox permission.

Manage Mailbox Permissions
As an authorized or domain administrator:
-
Log in to the Wisc Account Administration site with your NetID credentials.
-
Search for or select the account you want to manage.
-
Missing an account: If you do not see the account you want to manage or you are logged directly into your NetID account, please review the following document: Wisc Account Administration Site - Logging In.
-
-
Click the Office 365 tab and select the Permissions option.
-
In the Permissions for field, enter the NetID of a valid UW-Madison Microsoft 365 account.

-
Select the preferred Permission type (e.g., Send As, Send on Behalf, Full) and click Add Permission.
-
If successful, the following message will appear:

If unsuccessful, the following message will appear:

Note: If the process is unsuccessful or an error occurs, please contact the DoIT Help Desk.
Validate Mailbox Permissions
As an authorized or domain administrator:
-
Log in to the Wisc Account Administration site with your NetID credentials.
-
Search for or select the account you want to manage.
-
Missing an account: If you do not see the account you want to manage or you are logged directly into your NetID account, please review the following document: Wisc Account Administration Site - Logging In.
-
-
Click the Office 365 tab and select the Permissions option.
-
Review existing permissions within the permissions table:

Troubleshooting
- Missing user: If a user is missing from the permissions table, you will need to reassign permissions using the "Manage Mailbox Permissions" section.
- Fix permissions: Validate or fix permissions using the buttons within the "Validate Mailbox Permissions" section.
- Repair limitation: "Send on Behalf" of permissions cannot be repaired. You must remove and re-add this permission.
