We just migrated our Email infrastructure from the old Exchange 2000 to the 2007 version. After a successful migration of all mailboxes and completed testing, we set up a relay connector on the hub transport server to allow some of the application servers to relay through it. That as well went fine.
We only have an issue with one of the servers trying to relay, it sends empty emails. When i went to command prompt and did a telnet to port 25 on the hub transport it comes connected. I put in the commands for sending a mail, the commands don't show on the screen on command prompt but the response for each command is shown. For example when i type 'helo', it doesnt show it but gives a hello return. And when i type all the commands required and it sends the email, only the from address comes through, recipient and data typed comes blank.
The server is a windows 2000 server with SP4.