Exchange 2013 natively does not provide any option on the Send Connectors or Transport rules to set sender based routing. RouteBySender application allows you to route outgoing emails based on sender group membership or based on the combination of the sender’s and recipient’s domains.
Typical scenario of usage
Let’s assume that your Exchange 2013 server has only one send connector “Internet Connector” using DNS for the address space *. All messages leaving the organization will use this connector. Let’s further assume that you want to route messages from members of a certain group to a smarthost instead of using DNS. RouteBySender utility will help you to solve this problem.
Also this program can help if you have a requirement for some users to send their mail to a specific smart host to get delivered across a secure network.
It might be useful for local authorities needed to comply with strict mail routing rules for COCO and Government Connect policies to run this utility.
The application is a transport agent for Exchange server.
This description is not a review but information provided by the product vendor or obtained from the vendor's website.