What to know about a staged migration in Exchange Online

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Multiple email address can be configured for a single mailbox. The mail addresses other than the primary email address are called proxy addresses. Any email sent to the proxy address will be delivered to the primary email address, which is also known as the primary SMTP address.

Steps to add email addresses using M365 Manager Plus

  1. Go to the Management tab.
  2. Navigate to Exchange Online > Mailbox Management in the left pane.
  3. Under the Exchange Mailbox Tasks category click on Modify SMTP address using CSV option.

  4. Select the Microsoft 365 Tenant and click on the Download Sample CSV option.
  5. Fill in the CSV file with the new SMTP/proxy addresses of mailboxes.

  6. Using the Browse option upload the updated CSV file.
  7. Click on Apply and then Save.

Read more about Exchange Online management here.

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