How to grant the Send As permissions to a user account

To explicitly grant another account permission to send as a mailbox owner, open the Active Directory Users and Computers management console and follow these steps:

  1. On the View menu, make sure that the Advanced Features option is selected. If this option is not selected, the Security page will not be visible for User account objects.
  2. Open the properties of the user account that owns the mailbox.
  3. Click the Security tab.
  4. If the account is not already in the list of group or user names, add the account that should have the Send As permission for this user.
  5. In the Permissions box, click the Allow for the “Send As” permission for the appropriate account.
  6. Click OK.
  7. Restart the Microsoft Exchange Information Store service on the affected Exchange server.

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