1. In a web browser, navigate to portal.office.com, sign in, and select Outlook.
  2. Under the Groups section, select the name of the group.
  3. In the top right corner of the window, click on the gear icon to open the Settings section.
  4. Select Edit Group.

Manage Non-Members Ability to Send to a Group

  • Check/Uncheck the Let people outside the organization email the group box in the group settings.