This article describes how to enable Send On Behalf permissions via Delegate Access using Outlook 2007/2010/2013/2016.

When you enable Send On Behalf permissions for another user, it means that person can send mail on your behalf. Your delegate will be able to choose your email address in the From field when composing a message in Outlook. However, message recipients will see both your address and your delegate's address (as the actual author of the message):

From: Mailbox <delegate's address> on behalf of Mailbox <your address>

Note: there is another type of sending permissions called Send As permissions, which can only be enabled in CONTROL PANELfirst. Read the Knowledge Base article on How Do I Enable Send As or Full Access Permissions On An Exchnage Account? for more information.

Important: when Send On Behalf permissions are granted Send as option is automatically checked under CONTROL PANEL > Services > Mailboxes > click mailbox > Full access & Send as. But Send As permissions are not granted at the time. Click the Save Changes button to re-write Send On Behalf permissions to Send As permissions.

Granting Send On Behalf permissions

To grant Send On Behalf permissions, you need to add the user as a delegate for your mailbox in Outlook, and assign the delegate any level of access.

Outlook 2010/2013/2016:

  1. Click File > Info > Account Settings > Delegate Access.
  2. Click Add.
  3. Choose the mailbox from the Address Book.
  4. If you need the user to have partial access to your mailbox, you can specify the access level on the next screen. If you only need to give Send On Behalf permissions to the user, choose None for each folder.
  5. Click OK.
    delegates

Outlook 2007: 

  1. Click Tools > Options > Delegates.
  2. Click Add.
  3. Choose the mailbox from the Address Book.
  4. If you need the user to have partial access to your mailbox, you can specify the access level on the next screen. If you only need to give Send On Behalf permissions to the user, choose None for each folder.
  5. Click OK.

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:
    Show from
  2. Click From > Other E-mail address. Type in the address of the user or select it from address book and click OK:
    Add from address
  3. Send the message. It will show Your Name on behalf of Other User Name:
    Sent on Behalf