You can specify incoming mail delivery routes for each domain on the administrator console's Routes page. The following parameters should be specified in the route settings:
Fig. 1. Server Routes
You can also specify the accounts in the route parameters to which the route will apply. A set route will apply to all domain accounts by default.
If the "Address as local" option is enabled, the domain specified in the route will be considered local and the administrator does not have to set the applicable permissions in Relay Settings.
Fig. 2. Route parameters