I have a SBS 2008 server with exchange 2007 and Forefront. I am trying to open up unauthenicated outgoing relay on the internal LAN so some applications and devices can send email. I have setup a new receive connector following MS Technet's "How to Allow Anonymous Relay on a Receive Connector" documentation located here (I have tried both configurations):
When I try to send mail it still fails with a "530 5.7.1 Client was not authenticated" error. I need to permit internal devices such as scanners and applications to send internal and external mail.