Hi. I have followed the Perfect Ubuntu setup to the letter, but I am still getting errors. I have an odd setup, which may be giving errors to do with DNS.. it is: idealcare.co.uk = 188.8.131.52 (Web server externally hosted) mail.idealcare.co.uk = 184.108.40.206 (Mail server hosted in Head Office) ..obviously I have MX set up properly. We are migrating from Exchange Server which previously worked but was unreliable. I have installed ISPConfig and made a new user (web1_user), and configured Outlook. But when sending mails I get this: Code: The following recipient(s) cannot be reached: 'email@example.com' on 19/02/2007 17:20 550 <firstname.lastname@example.org>: Recipient address rejected: User unknown in local recipient table 'email@example.com' on 19/02/2007 17:20 554 <firstname.lastname@example.org>: Relay access denied Any help is greatly appreciated. It's driving me mad. Thanks for reading. James.