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4.7. Sending as Another User

Sending On Behalf of another user

To send a message on behalf of a different user:

1. Open a new email and go to Options. Click From to show the From field:
   
2. Click From > Other E-mail address. Type in the address of the user or select it from the address book and click OK:
   
3. Send the message. It will show Your Name on behalf of Other User Name:
   

Note: by default, messages sent on behalf of another user resides only at delegates Sent Items folder. If your Account is on Exchange Server 2016 or newer, messages can be copied to the Sent Items folder of the originating mailbox (on behalf of) which the message was sent. Contact Support to enable this feature.

https://kb.intermedia.net/Article/2165#:~:text=To%20send%20a%20message%20on%20behalf%20of%20a,From%20field%3A%20Click%20From%20%3E%20Other%20E-mail%20address.