This requires Send As permission on the account. If you have multiple accounts in Outlook, when you compose a new email message, Outlook picks the default account as the From account.
Outlook Windows
You can change which account is used to send a message.
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In the message window, above to To button, click From.
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Click the account that you want to use.
Microsoft support has additional information on sending email from another account and how to find the From button.
Outlook MAC
You can change which account is used to send a message.
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In the message window, above to To button, click From.
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Click the account that you want to use.
Microsoft support has additional information on sending email from another account and how to find the From button.
Outlook Web
You can change which account is used to send a message.
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Choose New mail above the folder list. A new message form opens in the reading pane.
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At the top of the message, choose
> Show From.
Microsoft support has additional information on sending email from another account and how to find the From button.