We have been getting the above error since rebooting our exchange server.
The service was running perfectly before the reboot so everything mus thave been configured correctly.
We are not receiving any inbound mail and the mail routing troubleshoot comes back with the above error.
I have checked the receiving connector and it looks OK to me.
I can telnet to the server; enter an external email as the sender which comes back sender OK but when I enter the rcpt to followed by a valid email address I get 550 57.1.1 unable to relay for <name@company.co.uk>
We have been stock for over a day now so any help most appreciated.