- Mailman-users - lists.mailman3.org

Trip report -- setting up mailman3 in gcloud
by Stephen Daniel May 24, 2026

May 24, 2026

Mailman people -- I've been running mailman3 in production in Google's cloud for about 4 years now. Recently I started seeing many bounces from members who subscribe from yahoo, aol, bellsouth, or verizon. The bounces were triggered by DKIM failures. DKIM failures in my setup are apparently not new. Some spelunking revealed I've had outbound DKIM failures for years. It is possible my system has never properly signed outbound emails. But now it matters to these email providers. I decided to spin up a dev/test instance. I installed mailman3 from scratch in a venv environment on Debian 12. I used these excellent instructions: https://docs.list.org/en/latest/install/virtualenv.html#virtualenv-install I got this: GNU Mailman 3.3.10 (Tom Sawyer) Python 3.11.2 (main, Apr 8 2026, 01:58:00) [GCC 12.2.0] What I learned (relearned from 4 years ago): - Getting mailman up is easy. - The hard part is getting traffic in and out. Postfix is complicated to set up in this environment. Getting all the DNS and multiple layers of proxies set up to access Postorius/Django/Gunicorn is not simple. - I took lots of snapshots along the way. I used those snapshots to back out of a couple of dead ends. Highly recommended. I have only one open issue. Shortly after I start mailman I get this warning: /opt/mailman/venv/lib/python3.11/site-packages/falcon/request.py:2483: DeprecatedWarning: The RequestOptions.auto_parse_form_urlencoded option is deprecated. Please use Request.get_media() to consume the submitted URL-encoded form instead. warnings.warn( I am ignoring this. Is there something I should do about this? In the end, after experimenting with many possible solutions (including installing openDKIM), the solution was simple. I added this line to my mailman.cfg: remove_dkim_headers: yes Once the DKIM headers were removed, my outbound SMTP relay happily signs the emails and all is well. (Or it least it is after hours spent learning how to configure the outbound relay properly.) Someday soon I need to completely reinstall my production environment, but for now, I'm continuing on. Thanks to this community for all you do. -- Stephen Daniel

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Howto discard all pending unsubscription requests in a list?
by Andreas Vetter May 20, 2026

May 20, 2026

Hi, a moderator managed to remove almost 2000 members from a list. Luckily unsubscription is set to moderated. Is there a script to discard all tose requests and get the members back on the list? I found https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/ thread/UB6HHD4Q2GQ5XSDDXWMKJHTTADXFT46L/#DNV6AU4E3EBS2JUTZQD64GBJM7JHT3WP but this is meant for single request and involves manual finding a token. My python skills are not existent, so I don't know how to use that for my situation. Any hints appreciated. TIA, Andreas

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Missing bits of French translation
by iMark May 13, 2026

May 13, 2026

Hi, I have a list set with "French" as its preferred language. The default emails such as the Confimation and Welcome get sent French. My browser (Chrome) has its default language set as French, and my PC's region and language are set as French. When I view the list's "Info" Postorius page I see some parts translated ... 1. Menu and button words are translated okay. eg: ENGLISH: Sign In FRENCH: S'identifier 2. Page heading words are translated okay. eg: ENGLISH: Subscription / Unsubscription FRENCH: Abonnement / désabonnement 3. Page text fails. eg. ENGLISH: You have to sign in to visit the archives of this list. FRENCH: Is in English. Looking at the .po file ... /opt/mailman/venv/lib/python3.11/site-packages/mailman/messages/fr/LC_MESSAGES/mailman.po "PO-Revision-Date: 2024-06-25 17:09+0000\n" None of the msgid strings for the 3 examples appear in the mailman.po file. So, as some strings are translated and others not (yet none appear in the mailman.po file), I'm thinking that either there is another translation file somewhere for Postorius that needs updating, or the missing msgid s were not included in the original .pot file. Am I on the right track?

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How to debug bounces?
by Stephen Daniel May 7, 2026

May 7, 2026

Colleagues -- I run a small mailman3 server with perhaps 10 lists. All the lists are small. Over the past two days about a third of the users in my most active list have been disabled by bounces. I assume the problem is with my setup, not with all of those users. How do I debug this? Can I see the text of any of the bounce messages to understand why the emails bounced? This issue might stem from my running somewhat old software. Currently running mailman 3.3.5. Thanks! -- Stephen Daniel

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How to build docs and how to contribute documentation
by mailman26＠xse.com May 6, 2026

May 6, 2026

I have mailman 3 working with sendmail (FreeBSD system) and when I was setting this up I found the "Sendmail" section of the docs to be somewhat thin: https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/docs/mta.h… It points to two different versions of the mailertable hack: https://gist.github.com/Maeglin73/72eb5b1e4ee66a383c2aa454726be9a5 https://gitlab.com/mailman/mailman/-/work_items/307#note_632495542 I got a version of this to work but was not satisfied because it required hacking either mailman or sendmail config to cleanup the domain in the recipient address. Eventually I realized that "mailman inject" could be use in very similar way to how mailman 2 lists work with sendmail (alias pipe to a command). This provides a path to submit messages without using LMTP. First, how does one build the mailman 3 documentation? I am mildly experienced with sphinx so the actual changes are not an issue. But I was only able to build mailman-suite-doc documentation; it wasn't obvious to me now to build docs for mailman core (let alone an of the other pages I find on docs.mailman3.org) Next, how are code and documentation contributions submitted for consideration? I'm a lot more familiar with github than gitlab and know how to fork but it didn't look like I would be able to submit a pull request. Craig

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captcha for subscription and account registration forms
by Johannes Rohr May 2, 2026

May 2, 2026

Dear all, in mailman installed in venv is there really no canonical way of integrating a captcha into postorius' subscription and account registration forms? We are increasingly getting hammered by spambots, and a captcha would seem like a simple and effective solution. Thanks for any suggestions! Johannes

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An introduction to Dynamic Sublists (Conversations) - GSoC 2026
by Archie Singh May 1, 2026

May 1, 2026

Hello everyone I am Archie Singh, a Computer Science Engineering student from the Indian Institute of Technology (IIT), Jodhpur. I am elated to announce that I have been selected as a contributor for Google Summer of Code 2026. I will be implementing Dynamic Sublists into the Mailman 3 Suite this summer. Mailing lists are essential for broadcasting, but high-traffic lists frequently fill up inboxes with replies to specific topics users might not be interested in. This project transforms this rigid broadcast model into an opt-in thread model. The goal is to ensure only the root email of a new topic is broadcast to the main mailing list. If the topic diverges into a specific task or discussion, subsequent replies will route strictly to a child list, delivering mail only to users who have explicitly opted in via email commands. I would love to hear your thoughts. Would an opt-in thread model be useful for specific topics? How do you folks handle email overloads? I will be updating more on: Blog <https://hashnode.com/@archiesingh> Thank you Regards Archie Singh

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Introducing my GSoC 2026 project: Domain Administration in Postorius
by Khushal A May 1, 2026

May 1, 2026

Hi everyone, I'm Khushal, a final year Computer Science student from R V College of Engineering, India. I've been selected for Google Summer of Code 2026 with GNU Mailman project. I'll be working on Domain Administration in Postorius. Right now, Mailman has roles like site admins and list owners, but domain level management is still limited. The idea of this project is to make the domain owner role actually usable. A domain owner should be able to create lists in their domain, manage those lists with the same permissions as a list owner, and edit domain level settings for their domain. For example, if multiple domains are hosted on the same Mailman instance, each domain can be managed independently by its own owner without needing full admin access. Would love to hear how you currently manage domains and if there are any pain points. I’ll be sharing updates here: https://hashnode.com/@a-khushal Thanks, Khushal (a-khushal)

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Mass subscribe operation fails with http error
by b.watts＠ucl.ac.uk April 30, 2026

April 30, 2026

Hi, We have a mailing list where the admin has configured a custom template: [list:user:action:invite] When inviting a user using Mass Subscribe, the operation fails with the error: HTTP Error 400: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer')) I have reviewed similar threads, including: https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/thread/… I have updated the config in: /etc/mailman3/settings.py to contain: POSTORIUS_TEMPLATE_BASE_URL = 'https://mailinglists.ucl.ac.uk' After adding that item, I've recreated the template and resubmitted the subscribe. But still get the same error. What could I try next? Regards, Brian Senior Systems Administrator, UCL ISD

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How to configure an announce-only list?
by mailman26＠xse.com April 29, 2026

April 29, 2026

I want to create a mailing list that is used for announcements only. I'd like attempts to post to be rejected with a notification. I was able to set the list pw and verify it works with the Approved header using this reference: https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/rules/docs… I find that if both: Default action to take when a member posts to the list Default action to take when a non-member posts to the list are set to "reject (with notification)", the approved header is ignored and messages are always rejected (posted via "mailman inject") Would it be bad to test the approved header before rejecting a message? Essentially always accept a message with a valid approved header? Is there another way for me to achieve this? On another front, I'm unable to have messages posted via "mailman inject" use postorius created list templates. Would it be difficult to add this functionality?

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