Mailman does not send mails when preferred_language is not English

:uk:/:us: Message template (english)

The “support” category is meant to ask for help or troubleshooting related to installing or using YunoHost or its applications. It is not to ask assistance on general system administration, network administration or special use cases that goes beyond the scope of the project. If you wish to discuss more advanced use case, please post in the “Advanced Use Case” category.

Before posting, please :

My YunoHost server

Hardware: Dedicated Kimsufi server
YunoHost version: 11.2.2
**I have access to my server : Through SSH
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : yes (but not in Mailman)
If yes, please explain:
If your request is related to an app, specify its name and version: app mailman3 v1.0

Description of my issue

We have installed mailman3 a few years ago and recently noticed that the following setting blocks mails from being sent to the list:

  • a list with preferred_language set to English USA properly delivers emails
  • if this setting is switched to French, emails are not delivered anymore (without any error message received by email). When the language is set to English again, all emails got delivered at once.

How can we debug this issue? I could not find any issue in mailman3 logs (nor mailman-web). Is there a way to see where and why these emails got queued (they are not queued in any postfix queue).

Thank you

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