Am Mon, Feb 23, 2026 at 03:59:23PM -0800 schrieb Mark Sapiro:
On 2/23/26 13:56, Laurens Kils-Huetten wrote:
I have recently installed mailman3 on a Debian trixie system.
How? By following <https://docs.mailman3.org/en/latest/install/virtualenv.html>, installing Debian packages or ??
I've used the debian packages:
apt install mailman3-full mailman3-web
While I managed to set up most of it (the mailing lists, postorius and also a working gateway to our inn2 news server) I'm seeing a weird duplication of messages, that seems to be related to the error messages posted below.
What is the result from the command
mailman conf -s nntp?
[nntp] gatenews_every: 5m [nntp] host: localhost [nntp] password: [nntp] port: 119 [nntp] remove_headers: nntp-posting-host nntp-posting-date x-trace x-complaints-to xref date-received posted posting-version relay-version received [nntp] rewrite_duplicate_headers: To X-Original-To CC X-Original-CC Content-Transfer-Encoding X-Original-Content-Transfer-Encoding MIME-Version X-MIME-Version [nntp] user:
What are all the settings for the list at Settings->Newsgroup Gateway in Postorius?
Gateway to mail: yes Gateway to news: yes Linked newsgroup: grenzland.test Newsgroup moderation: Not Moderated NNTP include subject prefix: No
When I switch off gating to nntp the duplication stops. Also only mail messages are duplicated, not the postings on the news server.
Any pointers as to what to look into, or how to remedy this problem are greatly appreciated :)
Thanks,
Laurens
here come the error logs: Feb 23 20:39:08 2026 (2776528) ACCEPT: <e4938b85cbd75c0b04867514fc0b8ad9@betola.de> Feb 23 20:39:10 2026 (2776528) ACCEPT: <e4938b85cbd75c0b04867514fc0b8ad9@betola.de>
The above duplicate post comes before the following error, so I don't think the error is related to the duplication.
makes sense, however when I set both Gateway flags to no I don't get those duplicates anymore. And obviously no error since mailman won't talk to NNTP.
Feb 23 20:39:12 2026 (2776530) <e4938b85cbd75c0b04867514fc0b8ad9@betola.de> NNTP error for test@grenzland.club Traceback (most recent call last): File "/usr/lib/python3/dist-packages/mailman/runners/nntp.py", line 94, in _dispose conn.post(fp) ~~~~~~~~~^^^^ File "/usr/lib/python3/dist-packages/nntplib/__init__.py", line 916, in post return self._post('POST', data) ~~~~~~~~~~^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/nntplib/__init__.py", line 909, in _post return self._getresp() ~~~~~~~~~~~~~^^ File "/usr/lib/python3/dist-packages/nntplib/__init__.py", line 492, in _getresp raise NNTPTemporaryError(resp) nntplib.NNTPTemporaryError: 441 Can't set system Injection-Info header field
This is a response from your nntp server.
Note: the above traceback indicates that this nntplib is standard-nntplib from PyPI which is normally only installed if Python is 3.13. If this is Python 3.13 and you have installed Mailman from other than the head of the gitlab branch, see <https://lists.mailman3.org/archives/list/mailman-users@mailman3.org/message/...>
It's python 3.13.5
I looked at the patch and it seems like the change is already applied to the debian package.
Thank you so much for having a look at this!
Cheers,
lkh
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
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