If there is a temporary problem with the primary email destination server, CASG will try to deliver the filtered mails to the next destination email server that is configured. If the failure is permanent, for example, unable to resolve hostname, CASG will try to deliver through the next alternative route.
To add additional destination routes
Click 'Destination routes'' from the 'Incoming' drop-down menu in the menu bar or the icon in the 'Incoming' configuration area.
The 'Destination routes' area of the selected domain will open:
Click the 'Add' button to add another alternative destination route.
The 'Destination routes' dialog box will be displayed.
Enter the alternative destination route and click the 'Save' button.
The added route will be displayed in the list.
If you want additional routes to be included, click to add more alternative destination routes.
You can also prioritize the routes by dragging and dropping from the list.
Click the 'Save' button to confirm the changes.
Click here for more details on how to check the routes.