the following snippet can be used to add more than one user to the grantsendonbehalfto property with Powershell and the Exchange Management Shell
get-mailbox dummy |set-mailbox -grantsendonbehalfto “testuser3″
$a = get-mailbox testuser2 | select-object grantsendonbehalfto
$b = get-mailbox dummy| select-object grantsendonbehalfto
$a.grantsendonbehalfto += $b.grantsendonbehalfto[0]
get-mailbox testuser2 |set-mailbox -grantsendonbehalfto $($a.grantsendonbehalfto)
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