How to check the rules in Exchange Online (Outlook) mailboxes from an administrator

This section summarizes how to check the rules in Exchange Online (Outlook) mailboxes from an administrator for incident investigation, etc. ## Step 1: Set up full access permissions in the Exchange Administration Center 1. Open the Microsoft 365 Admin Center. 2. From the left menu of the Microsoft 365 Admin Center, click on "Admin Center" and then "Exchange" to open the "Exchange Admin Center". 3. [In the Exchange Admin Center, click Recipients > Mailboxes in the menu on the left side of the screen. 4. Click on the mailbox of the user in question. 5. [In the Delegation tab, under Read and Manage (Full Access), click Edit. 6. [Click "+ Add members" and enter (or select) the email address or display name of the administrator granting full access or the user performing the operation, then click "Save". 7. [Click "Confirm" under "Do you want to add delegation of access permissions? It may take up to 24 hours for the Full Permissions settings to take effect. ## Step 2: Open a mailbox with Full Access permissions in Outlook on the Web and check the Inbox Rules. 1. Open Outlook on the web from your account as a user with full access privileges. 2. Click on the user's profile picture in the upper right corner of the screen and click Open Other Mailboxes. 3. Click on the gear symbol in the upper right corner, then click on "Show all Outlook settings" at the bottom of the settings window. 4. In the settings window, select "Mail" > "Rules". 5. You can check the rules by following the above steps.