Exchange 2010, Management Shell - Send on Behalf of issues.

Multitasker1 used Ask the Experts™
I've been adding "send on behalf of " permissions to users that share some mailboxes.

My issue is for example if I do the following....

Set-Mailbox "sharedmailbox" -GrantSendOnBehalfTo fred.flintstone
Set-Mailbox "sharedmailbox" -GrantSendOnBehalfTo wilma.flintstone
Set-Mailbox "sharedmailbox" -GrantSendOnBehalfTo barney.rubble

When I go into the Exchange management Console , right click "SharedMailbox" -> properties ->Mail Flow Settings tab -> Delivery Options

It will only show barney.rubble as having "send on behalf" permissions,  as if it over wrote the previous command.

I would think it would have simply added.

Is this a bug? or am I doing this wrong?

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there can only be one user with this right, or you need to create a security group including all these users and grant the group that right
Top Expert 2011

you can add all at once by doing this :

Set-Mailbox "sharedmailbox" -GrantSendOnBehalfTo fred.flintstone, wilma.flintstone, barney.rubble


Can we also list the users that have "sendonbehalf" priviledges on a mailbox, using the shell?
Top Expert 2011

Get-Mailbox -identity "username" | select-object grantsendonbehalfto

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