My first post on computing.net. Anyway I have a bit of a curly situation which I need to solve ASAP. I have setup an exchange server on Small Business Server 2003 for a client of mine. They can only receive emails from certain people which is very strange.
If I email anyone there from my gmail account or hotmail account they receive the email fine. If I try to send one from my pop3 account or from my exchange account at my business I get an error message thrown back at me saying that it is an invalid email address. Anyone got any suggestions?