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Exchange 2013 – Grant SendOnBehalf permission for Mailbox overwrites Existing permissions

Changing Send On Behalf setting in Exchange 2010 / Exchange 2013 or Exchange 2016 is quite simple task that can be easily done from GUI. It gets a bit more complicated when you try to add/change Send On Behalf rights from PowerShell.

Problem Description

Usually most people will go for

Set-Mailbox <UserToAddPermissionsTo> -GrantSendOnBehalf <UserToGivePermissionsTo>

It's a simple command but it actually does a very dangerous thing… it overwrites current GrantSendOnBehalf permissions. While it's not a problem when it's first time you set it up, it's a big deal when there are already multiple people added to GrantSendOnBehalf field.

Solution

Fortunately there's a simple way to do this to not overwrite this setting. Below you can find couple of commands that should make your life simpler.

function Add-DistributionListGrantSendOnBehalfTo { Param($newTrustee, $targetDistributionGroup)
    Set-DistributionGroup $targetDistributionGroup -GrantSendOnBehalfTo @{add=$newTrustee}
}
function Remove-DistributionListGrantSendOnBehalfTo { Param($oldTrustee, $targetDistributionGroup)
    Set-DistributionGroup $targetDistributionGroup -GrantSendOnBehalfTo @{remove=$oldTrustee}
}
function Replace-DistributionListGrantSendOnBehalfTo { Param($oldTrustee, $newTrustee, $targetDistributionGroup)
    Set-DistributionGroup $targetDistributionGroup -GrantSendOnBehalfTo @{add=$newTrustee}
    Set-DistributionGroup $targetDistributionGroup -GrantSendOnBehalfTo @{remove=$oldTrustee}
}
function Remove-MailboxGrantSendOnBehalfTo { Param($oldTrustee, $targetMailbox)
    Set-Mailbox $targetMailbox -GrantSendOnBehalfTo @{remove=$oldTrustee}
}
function Add-MailboxGrantSendOnBehalfTo { Param($newTrustee, $targetMailbox)
    Set-Mailbox $targetMailbox -GrantSendOnBehalfTo @{add=$newTrustee}
}
function Replace-MailboxGrantSendOnBehalfTo { Param($oldTrustee, $newTrustee, $targetMailbox) 
    Set-Mailbox $targetMailbox -GrantSendOnBehalfTo @{remove=$oldTrustee}
    Set-Mailbox $targetMailbox -GrantSendOnBehalfTo @{add=$newTrustee}
}

Simple usage of Exchange PowerShell commands from above:

Add-MailboxGrantSendOnBehalfTo -NewTrustee <AllowedUserToSendOnBehalf> -TargetMailbox <UserMailboxToManage>

Replace-MailboxGrantSendOnBehalfTo -NewTrustee <AllowedUserToSendOnBehalf> -OldTrustee <ReplacedUserToSendOnBehalf> -TargetMailbox <UserMailboxToManage>

Remove-MailboxGrantSendOnBehalfTo -OldTrustee <ReplacedUserToSendOnBehalf> -TargetMailbox <UserMailboxToManage>
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