How to set the postmaster address in Office 365

By default when Exchange Online in Office 365 is setup for your organization, the postmaster address, e.g. postmaster@domain.com is set to postmaster@domain.onmicrosoft.com. This means that when someone sends mail to your organization and gets an NDR back, the sender is: postmaster@domain.onmicrosoft.com. If you want to change this, you can do …

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