I have just tried to set up 2 new users on my Exchange 5.5 server and when i send a test mail from my hotmail to their accounts i am getting an undeliverable message saying my mail server doesn't recognise their names. These mailboxes have been set up the same away as all the others. I tried stopping and restarting the Internet Mail Service but am still getting the same errors. has anyone any ideas why this has started happening? Their has been no changes made to the mail server