I have a client who has a Exchange 2003 environment. Email flows in and out just fine internally. Problem is that no one is able to send mail externally using mail.mycompany.com. SMTP outbound security is set for Anonymous Access. I have tried setting the Outgoing Server settings on the client side to use the same login as the incoming access but that does not work. I am sure this is easy to fix but I am at a loss at what to change to resolve the issue. Incoming mail works just fine externally.