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"SMTP Protocol Returned a Permanent Error 550 No such domain at this location"
These delivery failure messages are received when trying to relay mail through your Domino server with a firewall between the sending and receiving server?
If so, the reporting MTA of the delivery failure could be your firewall then verify that you are not configured to not allowing relaying. Changes needed to be made on the firewall to allow relaying.
Feedback response number WEBB7KB3GN created by ~Bella Xanponepulnivu on 10/11/2008