We have a client running email on a 2011 SBS Server which send emails though their ISP's smart host. We had a situation yesterday where the smart host server stopped working and emails started backing up in Exchange, however users were blissfully unaware until about an hour later when one of their clients complained an email promised to them hadn't arrived. The ISP sorted the issue with their relay and all was up and running again within an hour or so. My client has asked me if there is any way we can receive an alert should exchange not be able to send emails so that we can react quicker rather than wait for hours and get a suspicion that something isn't working.
Does anyone know of a system within SBS 2011 or a 3rd party tool that would alert us in the future?