Assigning mailfrom permissions in Exchange 2013

Question

I want to be able to run a PowerShell to assign a single user the mailfrom permission on all mailboxes in the database / organisation.  I have been unable to find a script that will do this although I have found scripts that will do this on a per
user basis.  Can anyone point me in the right direction on this

Answer 1

Hi,
If you just want to give a user Send As permission so that this user can change the From field to any users in your Exchange server, we don’t need to give mailbox full access permission to this user.
With Send As permissions, users other than the mailbox owner can use that mailbox to send messages without accessing that mailbox. After this permission is granted, any messages that are sent from the mailbox will appear as if they were sent
by the mailbox owner.
When you grant the Full Access permission to another user for a mailbox, that user becomes able to log on to the mailbox and access its entire contents, make changes in others’ mailbox folders.
We can use the following script to give a user (Administrator) Send As permission to all users:
$AllUsers = Get-Mailbox -RecipientType UserMailbox
-ResultSize unlimited
$AllUsers | Foreach { Add-ADPermission -Identity $_.Name -User Administrator -ExtendedRights "Send As" }
Regards,
Winnie Liang
TechNet Community Support