I want to ensure that Exchange 2013/Outlook 2013 only accepts messages originating from a specific sender domain if they were signed by S/MIME. All unsigned messages should not be delivered to the recipient but trigger an alarm (log messages, ...) or shall be redirected to an admin.
Further I would like to ensure that all messages sent to this domain (outbound) are also signed. The system should deny sending unsigned messages to this domain.
Is this possible in Exchange/Outlook?