To automatically add new or existing email accounts to a distribution group in Office 365, you can use dynamic distribution groups. These groups update their membership based on criteria you define. Here's how:
- Sign in to Office 365 Admin Center.
- Navigate to Exchange Admin Center.
- Create a new dynamic distribution group, specifying criteria for membership.
- Add existing email accounts manually or define additional criteria.
- Test the group to ensure it adds members correctly.
- Monitor periodically to ensure it functions as expected.