The Exchanger server stopped working middle of the day with no rhyme or reason, nothing in the error log to why stopped. After backing up and finally reinstalling along with IIS still will not receive. An email was sent in house and received but that stopped working with in a half an hour. Have checked MX record, and smtp diagnostics run through MX toolbox all connect to smtp. Firewall has been ruled out and nic changed on the machine. No mail externally or internally.