How to "Send As" and "Send on behalf of" a shared mailbox in Outlook desktop application
After given delegated access permission, a person can send emails on behalf of another mailbox using Microsoft Outlook.
Note: The below instructions are not applicable on outlook through the browser.
Create or respond to an email message on someone else's behalf.
On the compose email box, click the From option and select the email address you need to send from. If you don’t see the From button, expand the compose email window to full screen, click Options on the top > click the 3 dots ... > Show Fields > click From.
If the email address you need, does not exist, simply add it by clicking From > Other email address. Type the full email address (double check the spelling).
Continue composing the email.
Please click here to see the complete guide on how to send as and send on behalf of, for an email in outlook.
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