A method, system and program for specifying message outputs in a messaging session are provided. A message entry is received in association with a particular topic from among multiple available topics from a particular user from among multiple users participating in a messaging session. Output attributes are assigned to the message entry according to receiving user specified output preferences for the particular topic individually specified by each of the receiving users participating in the messaging session, such that output of the message entry is uniquely specified for each of the receiving users participating.