This will only be useful if you are a listowner, and your list is administered using Mailman, and you use Linux/Unix/BSD. But if this fits you, give it a try! In your package manager, select listadmin, or use apt-get install listadmin or the equivalent in your distribution. To start the application, in your console, type listadmin. If it's the first time you've run listadmin, you'll first see a series of questions which when answered will fill in the file $HOME/.listadmin.ini. I found it easier to edit this file by hand until I found the correct way to enter the password and listnames. You can edit this file in any text editor; I prefer Kate.
Here's my file, with some sample lists:
username email@example.com password XxXxX spamlevel 8 # If you uncomment the following you will only have to press Return # to discard a message: # default discard # Uncomment the following to get a terse transaction log: # # log "~/.listadmin.log" firstname.lastname@example.org password XxXxXx email@example.comUsername in this case is the email account you use in Mailman to administer the list; password is the password exactly as you type it - no extra spaces or symbols, and list address takes a bit more explanation. I successfully figured out the listname so it worked by using the Mailman administration weblink for the subdomain and domain part. For instance, my Linuxchix link is http://mailman.linuxchix.org/mailman/admindb/listname, which becomes firstname.lastname@example.org. For Rootsweb lists, it's http://lists#.rootsweb.ancestry.com/mailman/admindb/listname, which becomes listname@lists#.rootsweb.ancestry.com, where # is the server number. The same procedure works for KDE lists: https://mail.kde.org/mailman/admindb/listname becomes email@example.com.
The coolest thing is that if you set up your ini file as I did, you can do ALL your Mailman lists in one run, no matter how many servers the lists live on, and how many passwords you use. Be sure to use a blank line after the last list in a group, then create another group as shown above.
For more information, see the author's description: http://heim.ifi.uio.no/kjetilho/hacks/#listadmin and the Manual: http://heim.ifi.uio.no/kjetilho/hacks/listadmin.txt