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 steps below are not applicable on outlook through the browser.

Send email on behalf of the other person

1. Open a new email message.
   
2. Above the To line, select From, then select the other person's mailbox. If necessary, select Other Email Address..., then enter that email address, then select it.
   
1. (If From isn't visible next to the To button, make it visible by going to the ribbon and under the Options tab in the Show Fields group, select From. - See screenshots below)
3. Finish composing the email, then select Send. 
   

Recipients of the message will see that it is sent by you on behalf of the other person. 

Classic Outlook

New Outlook

Please click here to see the complete guide. The instruction is found under the section Delegate: Send email on behalf of the other person

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