A friend of mine called me up with a question regarding exchange mail flow. They have an exchange server that houses mydomain.com at corporate. One of the branch offices also houses mydomain.com. If a user at corporate emails user1@mydomain.com on the exchange server, the message is delivered locally to that user. If a user emails user2@mydomain.com and that user is located over in the branch office (using Imail) they recieve the message. I thought since exchange was houses mydomain.com that if a user doesn't exist on that mail server then the user will get an NDR, I didn't think that exchange would then fail over to MX looksup....? How is this possible? Thanks.
