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Microsoft 365 (Apple Mail) - Using Send As or Send on Behalf Permissions
This document assumes you have been granted send as permissions or send on behalf permissions. The following steps show you how to send an email as this account.
The ability to send as someone or send on behalf of someone is not supported in Apple Mail. For performing this process, it is better to use the Outlook Web App (OWA), Outlook 2011 on a Mac or Outlook 2013 on a Windows machine.
Important: Make sure you understand what send as permissions or send on behalf permissions.