A relationship-based communications service system receives a communication from a source destined to a recipient. The recipient is capable of receiving the communication at a computing device. The communication service system determines a first relationship type based on a satisfied relationship condition between the source and the recipient. The communications service system sends a relationship-qualified version of the communication to the recipient based on the determined first relationship type. The relationship-qualified version of the communication of the determined first relationship type is annotated to present a different user interface behavior to the recipient at the computing device than a relationship-qualified version of the communication of a second relationship type.