We are running Exchange 2003 with the users on Outlook 2003. Today our server stopped delivering external emails to our internal network. We were able to send out emails internally and externally and we were able to receive within the network, just nothing from outside. Restarted the server and the emails on queue have slowly started coming through again. Can't figure out why it stopped to begin with. Any ideas of why or how to find out why? Event logs are not much help.