In the navigation pane on the left, select mail flow, and then make sure rules tab is selected.
You should be in the Exchange admin center. Click Admin centers to expand it, and then click Exchange. Sign in o office 365 using an Administrator account. Using an Exchange Online administrator account, log into the Office 365 portal.If you want to block all external emails, select the option that The sender is located -> Outside the organization. (If you want to turn off the rule, just un-tick it.) Note: If an invalid email address is used, your emails will be lost. Make sure there is a tick for the new rule. Then Click 'OK' Then click Save Click Yes, when the warning message prompt. Add the condition The sender -> is the person or domain is and specify the sender email addresses or domains to be blocked. Enter the email address of account you want to receive the emails. Paste them all and type semicolon for the last email address, they all will be moved to add. Open the Exchange Admin Center and select Mail flow. Now, click on Default spam filter policy. In Exchange admin center, click on protection and select spam filter. Office 365 Admin Center window will open. If you have more than one email address then make sure they are separated with semicolon ( ). Click on App Launcher in the upper left corner and select Admin.
Note: In this example, we will restrict email for a group so they can only send and receive messages within the organization In the Select members window, select the recipient which you wish to block or type the email address in the check names followed by semicolon ( ).
#How to block emails in office 365 admin portal how to#
How to Restrict Email Delivery in Office365 Block sending emails outside your organization for specific users or user groups by using Exchange Online mail flow rules. This is a popular request from our academic customers – How can we restrict student email accounts so they cannot send or receive outside of the organization? Here are the steps we use for Office 365: