I'm trying to allow some scanners on our LAN to relay through our Exchange 2007 server's SMTP. We previously had this working just fine before we upgraded. I've created a new receive connector that includes our local subnet as described in the article below. I've also set the permission for the anonymous user using the cmdlet, but I still can't relay. I of course do not want to make a mistake that would allow an open relay. Any suggestions?
I've tried testing SMTP from the command line using a machine on the LAN and I'm getting the following error.
530 5.7.1 Client was not authenticated