- Mailman-users - lists.mailman3.org

Internal Server Errors in mailmanweb.log
by Washington Odhiambo Dec. 25, 2025

Dec. 25, 2025

I keep seeing several errors like the below in my mailmanweb.log and not sure what the causa is. ``` [ERROR] [2025-12-17 18:24:22,053] [log] 1969696 140553251733568 Internal Server Error: /archives/list/ kictanet(a)lists.kictanet.or.ke/thread/C6QQOYBSQIWHJ7ALGSR23U44U2FHTFG2/ Traceback (most recent call last): File "/opt/mailman/venv/lib/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner response = get_response(request) ^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/hyperkitty/lib/view_helpers.py", line 137, in inner return func(request, *args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/hyperkitty/views/thread.py", line 238, in thread_index return render(request, "hyperkitty/thread.html", context=context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/shortcuts.py", line 24, in render content = loader.render_to_string(template_name, context, request, using=using) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/loader.py", line 62, in render_to_string return template.render(context, request) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/backends/django.py", line 61, in render return self.template.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 175, in render return self._render(context) ^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 167, in _render return self.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in render return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in <listcomp> return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 966, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/loader_tags.py", line 157, in render return compiled_parent._render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 167, in _render return self.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in render return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in <listcomp> return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 966, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/loader_tags.py", line 63, in render result = block.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in render return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in <listcomp> return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 966, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/defaulttags.py", line 321, in render return nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in render return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in <listcomp> return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 966, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/loader_tags.py", line 208, in render return template.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 177, in render return self._render(context) ^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 167, in _render return self.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in render return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in <listcomp> return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 966, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/defaulttags.py", line 238, in render nodelist.append(node.render_annotated(context)) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 966, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/loader_tags.py", line 208, in render return template.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 177, in render return self._render(context) ^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 167, in _render return self.nodelist.render(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in render return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1005, in <listcomp> return SafeString("".join([node.render_annotated(context) for node in self])) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 966, in render_annotated return self.render(context) ^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 1064, in render output = self.filter_expression.resolve(context) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/django/template/base.py", line 742, in resolve new_obj = func(obj, *arg_vals) ^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/hyperkitty/templatetags/decorate.py", line 42, in render return mark_safe(text_renderer(content)) ^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/markdown.py", line 120, in __call__ return self.parse(s)[0] ^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/markdown.py", line 93, in parse self.block.parse(state) File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/block_parser.py", line 457, in parse end_pos2 = self.parse_method(m, state) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/core.py", line 216, in parse_method return func(m, state) ^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/block_parser.py", line 368, in parse_block_quote text, end_pos = self.extract_block_quote(m, state) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/block_parser.py", line 345, in extract_block_quote end_pos = self.parse_method(m4, state) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/core.py", line 216, in parse_method return func(m, state) ^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/block_parser.py", line 387, in parse_list return parse_list(self, m, state) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/list_parser.py", line 64, in parse_list groups = _parse_list_item(block, bullet, groups, token, state, rules) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/list_parser.py", line 174, in _parse_list_item block.parse(child, rules) File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/block_parser.py", line 457, in parse end_pos2 = self.parse_method(m, state) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/mailman/venv/lib/python3.11/site-packages/mistune/core.py", line 214, in parse_method assert lastgroup AssertionError ``` Since they are many, perhaps the causa is the same thing that can be fixed? -- 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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Cannot Run Web Frontend
by dap1＠bellsouth.net Dec. 25, 2025

Dec. 25, 2025

I'm having trouble getting my web frontend working. When I try to access http://localhost/mailman3 I get a 503 error and the following in the apache2 error.log: [Tue Dec 23 13:08:41.584412 2025] [proxy:error] [pid 132768] (111)Connection refused: AH00957: http: attempt to connect to 127.0.0.1:8000 (127.0.0.1:8000) failed [Tue Dec 23 13:08:41.584578 2025] [proxy_http:error] [pid 132768] [client 2600:1700:5cac:4600:fc36:9a27:6e66:44b:49658] AH01114: HTTP: failed to make connection to backend: 127.0.0.1 This is the relevant part of apache2's 000-default.conf: <IfModule mod_proxy.c> ProxyPreserveHost On ProxyPass "/mailman3" "http://127.0.0.1:8000/mailman3" ProxyPass "/archives" "http://127.0.0.1:8000/archives" ProxyPass "/accounts" "http://127.0.0.1:8000/accounts" ProxyPass "/admin" "http://127.0.0.1:8000/admin" ProxyPass "/user-profile" "http://127.0.0.1:8000/user-profile" </IfModule> What is a bit confusing but probably unrelated is this is in the virtual section for port 80 rather than port 443. I don't see any errors anywhere else.

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Internal server error instead of web interface
by Christian H. Kuhn Dec. 18, 2025

Dec. 18, 2025

Hi all, https://lists.qno.de/mailman3 shows an internal server error. I followed https://docs.mailman3.org/en/latest/install/virtualenv.html with MariaDB instead of PostgreSQL. Python 3.13.0 pip 25.3 mailman 3.3.11b mailman-web 0.0.10.dev14?g0997bd postorius 1.3.13 Services mailman3, mailmanweb, apache2, uwsgi up and running. uwsgi listens on [::1]:8000, apache2 is configured accordingly. Ports show up in netstat. No errors show in logs. If /mailman3 was a directory, i would have thought of user permission problems. But not with TCP ports. As :8000 is available, i would have thought that there is a problem with uwsgi. Requests arrive there and are processed: [pid: 3185672|app: 0|req: 10/17] ::1 () {28 vars in 409 bytes} [Mon Nov 3 13:24:05 2025] GET /mailman3/ => generated 5038 bytes in 28 msecs (HTTP/1.0 200) 8 headers in 261 bytes (1 switches on core 0) So uwsgi gets the request and delivers data. The problem seems that apache2 does not get the result, and i cannot find any reason. Any help? TIA QNo

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Mass operations on large list - Internal Server Error
by Liam Reilly Dec. 18, 2025

Dec. 18, 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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Stand 18.12.2025
by Markus Grandpré Dec. 18, 2025

Dec. 18, 2025

Hallo zusammen, Blockierte Annahme von E-Mails: * t-online, Austragung beantragt. Verzögerte Annahme von E-Mails: * google.com, bis zu 22 Stunden, * yahoo, bis zu 20 Stunden. Bewertungen der Mailausgangsserver: * Senderscore: 43 (poor) / 46 (poor) * Talos (Ciso): neutral / neutral Gruß Markus -- Markus Grandpré (he/him) Universität Konstanz Kommunikations-, Informations- und Medienzentrum (KIM) Abteilung IT-Dienste Forschung, Lehre und Infrastruktur Sachgebiet Diensteadministration 78457 Konstanz Tel: +49 7531 88-4342D

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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.

3 2

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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