You can't send as another user if you have the S/MIME control installed. To be able to send as another user, you need to select Always show From on the Mail tab or uninstall the S/MIME control.
You can't run this task on an Edge Transport server that is subscribed to an Active Directory site. You must either perform ...
You can't run this task on an Edge Transport server. You must perform this operation using the management console on a Hub ...
You can't search for admin audit log entries because the arbitration mailbox 'SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}' ...
You can't send a message on behalf of this user unless you have permission to do so. Please make sure you're sending on behalf ...
You can't send as another user if you have the S/MIME control installed. To be able to send as another user, you need to ...
You can't set the LinkedReceiveConnector parameter if any one of the following conditions is true: the AddressSpaces attribute ...
You can't set the UseDowngradedExchangeServerAuth parameter to $false if any Receive connector on the transport server has ...
You can't share calendars from sharing invitations in your personal archive. Please move the sharing invitation to your mailbox ...
You can't specify a value for the SourceTransportServers parameter for Send connectors configured on Edge Transport servers. ...