A communication terminal includes a transceiver and a controller. The transceiver receives electronic messages from another communication terminal. The controller responds to receipt of each of the messages by examining content of the message according to at least one defined rule and to control sound characteristics of an alert tune that is played through a speaker responsive to the examined message content. The controller may attempt to match text from the message to a stored list of words and/or phrases, and to control the sound characteristics of the alert tune in response to an outcome of the matching.