I am trying to get a better understanding of how MX records work. I have only ever setup exchange servers with one MX record. If I added a secondary MX record will mail get sent to that additional server too? What I am trying to get is something that will still recieve mail if the primary MX is not reachable....and once it comes back up again I need something where secondary MX will then re-send all the mail the primary server missed. Is this possible?