Microsoft 365 (Outlook on the web | Outlook for Windows/Mac) - Send as or Send on-behalf of another account

There are times when you need to send a message either as a another account or on-behalf of another account. Before you proceed, make sure you understand what send as permissions or send on behalf permissions are.

This document assumes you have been granted send as or send on behalf permissions to another account.

Note: If you are linked to a service account, you are automatically provided "full mailbox" and "send as" permissions to the account. This means you can open up the mailbox and 'send as' that account.

Important: In order to send-as or send-on-behalf of an account via Outlook desktop client, the account must be visible in the Global Address List (GAL). Check visibility. If the account is hidden, you must make it visible. Office 365 service accounts are hidden by default within GAL.


Depending on the permissions you have, the recipient(s) will see one of the following formats when receiving the message:

  • Send as permissions: Your message will appear to have come from the user that granted you this permission.
  • Send on behalf of permissions: The "From" address in any message sent by you will indicate that the message was sent by you on behalf of the user that granted you this permission.


Keywords:
microsoft office365 o365 m365 microsoft 365 send as permissions granted delegate delegated grantee outlook on the web owa 2019 2016 proplus windows mac os macintosh office on behalf of service account linked netid sending emails delegates read write subscribe owner none contributor reviewer non-editing author publishing editor editor publishing author author custom availability only limited details full details editor delegate 
Doc ID:
40879
Owned by:
O365 S. in Microsoft 365
Created:
2014-06-07
Updated:
2024-08-19
Sites:
DoIT Help Desk, Microsoft 365, Wisc Account Admin