How to add a keyword in the subject field?

Hello, I would like to know if it is possible to automatically add a keyword in the subject field. For exemple, I'm subscribed to a mailing list and the subject is always like [java-list]...., when I see a message with this subject, I know that it is comming from the java mailing list. Thank you! Martin St-Laurent, ing. mstlaurent@neosoft.ca