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Rackspace: Add "Delegate Full Access" for User Mailboxes
The Riva connection user for Exchange requires "Delegate" full access permissions to the mailboxes of the target users.
For Rackspace customers, assigning "Delegate" full access permissions is done by using the online Mailbox management console.
For on-premises Exchange systems, this is normally configured by using Exchange Management Console. For more information on full access permissions, delegated access, and impersonation, see Prepare the Exchange mailbox for the Riva connection user.
To add delegate full access for user mailboxes:
Create a mailbox or use an existing service mailbox that Riva can use to connect to Exchange.
With hosted Exchange services, the Riva connection account should be an administrator level account that is granted "Delegate" full access permissions to each target user.
To grant full access permissions in Rackspace: