Mailing lists are public mediums, with no real confidentiality.
See the Internet Security section for more information on general Internet security issues. Your email address will be revealed to others if you send a message to the list. Your address may even be accessible if you don't send anything to the list, if the list has a subscriber review command. See the specific sections on Listserv, Listproc, and Majordomo for advice on concealing your address from this command if you wish. Your opinions may be recorded and redistributed by others.