Described herein are systems, methods, and software to enhance secure communications between computing systems. In one implementation, a communication service identifies a communication request from an application on the computing system to transfer data to a second application on a second computing system. In response to the communication request, the communication service identifies a communication group of a plurality of communication groups associated with the application and the second application. Once the communication group is identified, the communication service identifies a communication quality of service based on the identified communication group, and transfers the data associated with the communication request to the second computing system in accordance with the communication quality of service.