My initial reaction to the suggestion of changing the group name was an immediate NO, that's a bad idea. However after looking into it a little (and seeing yet another mis-directed message appear), I've changed my mind. The main thing I found when looking into it is that changing the "Group name" (which appears in the upper left in a large font on all the group pages) wouldn't affect the group email address, so email subscribers would not have to update filters, etc. Email subscribers who never even look at the Google groups pages might never even notice a change in "Group name".
However, I can see it might be inconsistent/confusing to have a group named "Django internals" with an email address of
django-d...@googlegroups.com, so I can understand if you still don't want to mess with it. However I did notice something else that might help: a welcome message for the group. A welcome message, if it existed, would show up on the main group page (
http://groups.google.com/group/django-developers) in between the "Home" and "Discussion" banners. If you put a welcome message there that said:
NOTE: This group is used for discussion of developing Django itself, not user
questions; Please use django-users for issues regarding using the
framework, questions for the Django user community outreach, etc.
new users might actually notice it. It would at least (likely) be on the first page they come to when they find the group versus having to hope they think to click on the "About" link before deciding to post. It might still be missed by some, but I expect it would cut down on the number of misdirected posts, and it has no downside that I can see.