Public bug reported:

NewsRunner, when gating a list post to usenet, will append the appropriate usenet group name to any existing Newsgroups: header in the post that doesn't already contain the name.

If the existing names in the header are a group or groups that don't exist on the gated news server, at least one server has been observed to reject the post. In some cases with the python-list@python.org list, we have seen

441 No valid newsgroups in "gmane.comp.python.general, comp.lang.python"

This would actually seem to be a bug in the news server, but I will try prepending rather than appending the group name to see if that helps.

** Affects: mailman Importance: Medium Assignee: Mark Sapiro (msapiro) Status: In Progress