- Mailman-users - lists.mailman3.org

Mass operations on large list - Internal Server Error
by Liam Reilly Dec. 17, 2025

Dec. 17, 2025

Hi, A list owner has reported that their list page for list of 3460 members crashes with "internal server error" when attempting to do mass operations such as unsubscribe all or large mass subscribe of many members. Has anyone else experienced this? Thanks, Liam

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migrating mm21 to mm3 with different domain
by Thomas Krichel Dec. 17, 2025

Dec. 17, 2025

Hi gang, I want to migrate mm21 to mm3, by changing the domain of the list, thus LIST@OLD_dom to LIST@NEW_DOM. I run on debian, with the debian testing version of mm3 installed. Is there an obvious way to do that? Right now I think 0. create new list 1. read mm21 pickle to change the domains in it, write to temporary pickle 2. run mailman import with that pickle 3. read the archive mailbox and change the domain in all the headers 4. change the domainname in bodies and attachments (?) 5. run hyperkitty import This may be the project of a madman... any advice? -- Written by Thomas Krichel http://openlib.org/home/krichel on his 22110th day.

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One-click unsubscribe?
by Jered Floyd Dec. 16, 2025

Dec. 16, 2025

I'm having a lot of problems with GMail delivery due to lack of "one-click unsubscribe" -- however that is quantified, which is not clear. In particular, there is an issue with the fact that Google ignores dots in email addresses. So I have many (MANY!) subscribers who try to use the List-Unsubscribe header target, but because they are subscribed as "idiotsubscriber(a)gmail.com" rather than "idiot.subscriber(a)gmail.com" (which they have since changed their sender to) they get a reject that they are not subscribed. These people are also far too unobservant to read the footer of every message that reads "You are subscribed as idiotsubscriber(a)gmail.com". Is there any way to provide personalized List-Unsubscribe header links, or have Mailman ignore dots in gmail.com addresses... or... anything? I'm finding reported spam percentages in the Google Postmaster Dashboard exceeding 0.1%, which causes massive delivery blocking to GMail-based subscribers. While I would gladly ban everyone who uses gmail, that sadly accounts for about half of the Internet today and would be incredibly unproductive. Thanks, --Jered

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Postorius permissions granularity
by Liam Reilly Dec. 16, 2025

Dec. 16, 2025

Hi, Is there a way to have more granular permissions in Postorius than either User or Superuser? The user permissions that are configurable under /admin/auth/user/ do not seem to have any effect. We have a helpdesk team that would benefit from being able to access all list pages in the same way as a Superuser, but without the ability to accidentally delete the mail domain for example. Thanks, Liam

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Reject email based on message size.
by Hitashi mancho Dec. 16, 2025

Dec. 16, 2025

Dear all, We have a few mailing lists with a message size limit of 512K. At the same time, these mailing lists are moderated by designated moderators. As configured, posts with a message size greater than 512K are held for moderation. However, even after multiple reminders, some moderators accept these postings. Is there a way to automatically reject all such messages with an appropriate rejection reason? Can we implement a custom rule or a plugin that will help in this case? Regards, Hitachi.

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Strange bug I can't reproduce
by MegaBrutal Dec. 15, 2025

Dec. 15, 2025

Hello, I have an application that populates the Reply-To header and sends the e-mail to the list. Under very specific conditions, Mailman may malform this Reply-To header. What I found out is that the second address must match the pattern "Some Name" <a.b0(a)example.com>. The e-mail is properly formatted when it gets into Mailman, but when it is sent out to list members, it gets malformed to Some(a)serverhostname.example.com. Some more info: the first address name is UTF-8 encoded and then "Some Name" wraps into the other line at the middle. I tried to reproduce it like this: Reply-To: =?utf-8?b?QUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQQo=?= < list(a)example.org>, "Some Name" <a.b0(a)example.com> But the problem is not triggered. The problem seems to only present when I send the mail from the application, and so it would be easy to blame the app, but again when I check the queue files, it seems to send the e-mail correctly. It really seems to be a problem with Mailman, I just can't find the exact conditions to trigger it. For privacy reasons I can not share the exact copy of the e-mails on the list, but would it be possible to send it privately so devs could find out where might be the problem? Best regards, MegaBrutal

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Hyperkitty attachments
by Eric Broens Dec. 11, 2025

Dec. 11, 2025

Hi, Hyperkitty provides the possibility to store attachments on the disk by the config parameter HYPERKITTY_ATTACHMENT_FOLDER. Is it possible to export attachments to disk if they are stored in the DB, and have them linked into the archived mail? Is it possible to decide per mailinglist if attachments should be stored in DB or on disk? If not, I would like to request this feature. Thanks, Eric

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Using clean_users.py
by Odhiambo Washington Dec. 8, 2025

Dec. 8, 2025

I have run clean_users.py with: DELETE_MAILMAN_USER = True DELETE_DJANGO_IF_MAILMAN = True However, when I go to https://mm3-site/mm/lists/listname.mm3-site/members/nonmember/ I still have hundreds of users listed despite the script having run and it showed hundreds of addresses removed. What might be the issue? I expect to NOT find anything listed as nonmembers. -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 In an Internet failure case, the #1 suspect is a constant: DNS. "Oh, the cruft.", egrep -v '^$|^.*#' ¯\_(ツ)_/¯ :-) [How to ask smart questions: http://www.catb.org/~esr/faqs/smart-questions.html]

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Removing the footer from mailing list messages
by MegaBrutal Dec. 7, 2025

Dec. 7, 2025

Hello, I'm replacing a Postfix virtual_alias_maps distribution list with a GNU Mailman mailing list because there were many bounced messages, as Postfix doesn't care about properly resending e-mails. I want to kind of restoring the same functionality with Mailman, i.e. to be it as transparent as it can be, neither non-members, nor members should see how the list is implemented by Mailman. Therefore, I want to remove the „XX mailing list ...; To unsubscribe send an e-mail to ...” message from the footer of the e-mails. The problem with this is that list members sometimes reply to e-mails from non-members, and might potentially leave the footer in the quote. What I already tried: define a custom template for list:member:regular:footer. The result was that the mailing list stopped operating altogether, no messages passed through until I deleted this template. After I deleted it, all delayed e-mails were forwarded at once. What would be the right way to remove the footer? Best regards, MegaBrutal

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Hyperkitty: Determine the size of an archive
by Frank Richter Dec. 6, 2025

Dec. 6, 2025

Hi, we’d like to inform our list owners of archive enabled lists about the (approximate) size of their archive. In Mailman 2 we used the size of the mbox file. Now how can I determine the size of the archived e-mails of a list in Mailman3 with Hyperkitty? Any ideas? Thanks, Frank -- Frank Richter, Chemnitz University of Technology, Germany

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