A computing device can receive an incoming message. The incoming message can be one directed to a set of different client machines at approximately the same time. The computing device can perform a mitigation action that alters a presentation characteristic of the audible alert for the incoming message. The mitigation action ensures that the computing device and at least a subset of the other client devices within a predefined audio range of the computing device do not audibly present alerts for the incoming message in an unsynchronized manner.