Hi,
Alpine Linux is testing mailman3 as system for project mailing lists. We created docker-compose which can be seen here https://gitlab.alpinelinux.org/alpine/infra/compose/mailman
We installed it and run in testing system here https://lists-test.alpinelinux.org/hyperkitty/
Sending mail by mail clients works and mails are sent to subscribers properly. Most other 'things' works but we have problem with reply to posts and creating new threads using web ui. When replying to post with web ui it says that the everything is ok and post is sent but post doesn't arrive to mailing list. Same happens with creating new thread.
Our debug says "KeyError: 'display_fixed'" but we are not sure what should be changed/fixed/set for this problem. Attached is excerpt from debug log.
TIA, mps