USE AT YOUR OWN RISK.
This script will backup all of your email addresses with names from Mailman subscription lists, even for lists large enough to span multiple pages. It has been tested on Mailman version 2.1.5.
This script is provided courtesy of www.thepeters.org with contributions by Craig Norberg-Bohm to make it work with larger lists.
For BEST SECURITY, put this script into YOUR OWN php installation and run it OR CHANGE YOUR PASSWORD RIGHT AFTER YOU RUN THIS. I am in a shared hosting environment and have little control over security, including someone hacking this script.