Mailman 3 May 2026 - Mailman-Developers

A fix for running tox tests locally on Mac systems
by Archie Singh May 25, 2026

May 25, 2026

Hai Hai :) I was running some tox tests on my mac system for a mailman core issue I was working on, and got this error, "AttributeError: module 'os' has no attribute 'fdatasync'" apparently apple never built fdatasync into the macos kernel :( A fix I did was using the multipass VM to build my ubuntu env > mount the working directory > create a venv (in the home linux directory btw!) > ensure the cache builds in the native linux memory only > then ran the tox tests. This might seem a little tedious for those who want to work on the go. And sooo for those who wish to still work on their macos (without vms) just change all instances of 'os.fdatasync(fp.fileno())' to 'os.fsync(fp.fileno())' in src/mailman/core/switchboard.py, and then run tox in your mac environment itself! If you are working on something do NOT commit this change to your branch and discard this change as soon as you run the tox tests on your mac! PS. I do prefer VMs but the quick change also worked for me! I hope this helps the mac users >_< Regards, Archie

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[GSoC 2026] Per-List Backup and Restore (introduction)
by Navya Khanna May 2, 2026

May 2, 2026

Hello All, I'm Navya Khanna, one of the accepted GSoC 2026 contributors for GNU Mailman. My project is Per-List Backup and Restore: two CLI commands (mailman backup and mailman restore) backed by a schema-validated JSON export format, giving Mailman 3 administrators a reliable path to list-level disaster recovery. I am grateful for the support I got during the application period and I hope for the same throughout the project!! One quick heads-up for my mentors: my university end-semester examinations run from June 9 to June 24. I've already mentioned this in my project timeline (lighter deliverables scoped into that window), but I believe, because of the number of applications, everyone might not have a chance to read it. Regards, Navya Khanna

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[GSoC 2026] Improved UI for Subscription Management (introduction)
by Amit Chaudhary May 2, 2026

May 2, 2026

Hi everyone, I'm Amit (Amitxtech), a GSoC 2026 contributor working on Mailman this summer. I'll be working on improving the UI for Subscription Management in Postorius. The focus is on making the subscriber management page more usable for list owners - adding sortable display name columns, bookmarkable filter dropdowns (status, delivery mode, moderation action), an inline expandable row for editing member preferences without page navigation, and lock icons for private list visibility. Thanks to Steve and the community for the guidance and support during the application period. Looking forward to working with everyone this summer. Best, Amit

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

May 1, 2026

Hi everyone I'm Archie, and I am elated to announce that I have been selected as one of the contributors for Google Summer of Code 2026. Thank you all for your guidance and support during the application period. For my project, I will be implementing Dynamic Sublists into the Mailman 3 Suite. The plan is to extend the SQLAlchemy schema with a self referential parent_id, allowing users to dynamically provision child MailingList objects via the -new or -follow email commands. Being native objects, they naturally inherit the configurations of the parent list and use the existing member_recipients handler for routing. I'm really looking forward to working on the project this summer! Regards Archie Singh

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[GSoC 2026] Domain Administration in Postorius (introduction)
by Khushal A May 1, 2026

May 1, 2026

Hi all, I’m Khushal (a-khushal), selected for Google Summer of Code 2026 with GNU Mailman. I’ll be working on Domain Administration in Postorius. The focus is on completing the domain owner role by improving permissions so domain owners can manage lists within their own domain. Thanks for the support and feedback during the earlier discussions around this project. Looking forward to working with you all during the coding period. Best, Khushal (a-khushal)

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