Looks the umbrella list option is working. I figured out how to add nonmembers. Here's the setup I tested with (names / domains changed):
===== list-all members list-0000@example.com list-0001@example.com
list-all nonmembers with moderation_action = Action.defer siteadmin@example.com
===== list-admin members admin.user@example.com
list-admin nonmembers with moderation_action = Action.defer admin.user@example.com list-all-bounces@example.com list-0000-bounces@example.com list-0001-bounces@example.com ... (every notification list)
===== list-0000 members list-admin@example.com some.body@gmail.com
list-0000 nonmembers with moderation_action = Action.defer admin.user@example.com list-all-bounces@example.com
When sending to the list-all list, the email gets sent to each of the member lists adn subsequently the list-admin list. I did not see duplicates sent to the admin list even though the list-admin list was included twice (one for each member list)
I wrote a python module to configure the list details (hopefully attached) The following steps are used to configure the lists. Run as mailman user.
# Create special list-all list mailman create --owner siteadmin@example.com list-all@example.com mailman shell -l list-all@example.com --run configure_list dummy_value
# Create specal list-admin list mailman create --owner siteadmin@example.com list-admin@example.com mailman shell -l list-admin@example.com --run configure_list dummy_value
# CONFIGURE A NOTIFICATION LIST (4 steps)
mailman create --owner siteadmin@example.com list-0000@example.com
# ues-admin list gets copied on posts sent to every list echo 'list-admin@example.com' | mailman addmembers --delivery regular --no-welcome-msg - list-0000@example.com
# Configure the list options mailman shell -l list-0000@example.com --run configure_list "Short Description"
# The following should be run for each new notification list to allow copies to go to the admin list mailman shell -l list-admin@example.com --run configure_list list-0000
From: Sparks, Paul Sent: Friday, July 25, 2025 13:38 To: Mailman 3 Users <mailman-users@mailman3.org> Subject: Advice on how to set announcement only lists?
Here's the basics of what I'm trying to set up: The Web UI is not available. CLI tools are being used for configuration and ongoing maintenance functions. The server instance is ephemeral, but has persistent storage for postfix / mailman configuration. There are a series of notification lists list-0000@example.com, list-0001@example.com, etc. Users can subscribe / unsubscribe via email. A list-all@example.com list can be used to send posts to all lists (this is rare). A siteadmin@example.com email address is the only sender allowed to post to any list. A list-admin@example.com list is defined. This list should be copied on all posts that are sent to any of the notification lists. The admin list membership is maintained via CLI tools by list admins
Below are a couple of ideas I've played around with, but haven't gotten a good solution. Suggestions would be welcome. I've had a little experience with the CLI tools, but I'm not having luck with trying to add non-members.
Idea 1 Have list-all@example.com be an umbrella list with all notifications lists as members. list-admin@example.com is added to all lists as a member siteadmin@example.com is added to all notification lists as a member with moderation_action = Action.defer to allow sending posts. ues-all@example.com is added to all notification lists as a member with moderation_action = Action.defer to allow "nested" sending to members of the list-all list. There seem to be issues with having the senders as members of the list. Having them as non-members might be a solution, but I haven't yet figured out how to add non-members via CLI.
Idea 2 Use cron with CLI tools to extract all notification list members and update (mailman syncmembers) the list-all membership. Use script to add all list-admin users to each notification list. Update all notification lists when the list-admin membership changes. This is somewhat problematic since individuals could be direct members of notification lists and removal from list-admin would remove the direct membership. siteadmin@example.com is added to all lists as a member with moderation_action = Action.defer to allow sending posts.
The contents of this e-mail, including attachments, are intended for use by the named addressee only and may contain information that is confidential or private according to applicable law. If you received this electronic transmission in error, please notify the sender by a reply to sender only message, permanently delete the original message and any attachments from your electronic device and keep this message confidential. Unauthorized use, copying, review and/or distribution to unauthorized persons is strictly prohibited and subjects the user to penalty of law. Thank you for your cooperation.
Mailman's content filtering has removed the following MIME parts from this message.
Replaced multipart/alternative part with first alternative.