One of our clients needs all users with a mailbox to be granted Full Access and Send on Behalf permissions to another shared mailbox.

The easiest way to do this would be to give a security group the needed permissions, but Exchange 2013 is only allowing delegates that are users. I've tried via ECP and the following (assuming "sharedemail" is the shared mailbox and "AllUsersSecGroup" is an AD Security Group):

Set-Mailbox -Identity "sharedemail" -GrantSendOnBehalfTo "AllUsersSecGroup"

I can't use Add-MailboxPermission because there's no operator for Group instead of User.

1 Answer 1


The fact that you are setting the permission to a group makes no difference. You can still use add-mailboxpermission and enter the group name as the user. I usually enter the group name as domain\alias.

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