official debian-user mailing list archives
http://lists.debian.org/debian-user/

debian-user mail-archive
http://www.mail-archive.com/debian-user@lists.debian.org/info.html

debian-user gmane-archive
http://news.gmane.org/gmane.linux.debian.user

debian-user supereva
http://mailgate.supereva.com/linux/linux.debian.user/

debian-user@opensubscriber
http://www.opensubscriber.com/messages/debian-user@lists.debian.org/topic.html