Christian H. Kuhn via Mailman-users writes:
thank you for your answer. I did both updates, and haven't seen the warning since.
You're welcome to ask here, but depending on sleep schedules you often will get a quicker answer by web-searching or searching our archives for keywords like "ACCOUNT_AUTHENTICATION_METHOD" and so on. You may need to search more than one key in this case, because IIRC the warnings showed up in different releases of Django.
Also, as far as I know there are no known cases where warnings, especially deprecation warnings, actually cause Mailman apps to fail. So you can breathe easier.
Obviously you want to deal with these early because they're authentication, and similarly for things related to security. But the system will keep running.
Steve
-- GNU Mailman consultant (installation, migration, customization) Sirius Open Source https://www.siriusopensource.com/ Software systems consulting in Europe, North America, and Japan