Exchange Error – Event ID 7010 with 550…

Hi,

I am running SBS for Windows 2003 with Exchange 2003. I have Firebox x700 in place.

My Application Event log is being flooded with the Event ID 7010.

The error is:
“This is an SMTP protocol log for virtual server ID 1, connection #962. The client at (my Exchange Server IP) sent a “rcpt” command, and the SMTP server responded with “550.5.7.1 Unable to relay for (a client that does bot exist in my domain).” This will probably cause the connection to fail.

I used the telnet command to verify that our Exchange server is not an open SMTP relay.

This error is occurring at a rate of about every 3 to 4 minutes every day, all day.

Any help would be greatly appreciated!

Jim