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I have been attempting to setup a backup MX server for my existing smartermail install. I have configured the new server and added DNS records to reflect the new server as well. The issue I am running into is any mail sent to the server gets a 550 error no such user here response. I have seen other threads with this issue but haven't been able to figure out what the issue could be. On the backup server I have configured an incoming gateway, selected Backup MX as the mode. I have selected Web Service as the user verification, checked the box to enable smartermail gateway mode and entered in the url and credentials for a system admin on the main server. Any ideas where I went wrong?