Comment 3 for bug 418728

We could argue forever about whether or not the default is reasonable or not, but that is not the issue as I see it. The Issue is that we provide a way for the list owner to set any message she chooses, and the owner of the specific list in question has not done that. I think your energy would be better spent trying to get the list owner to provide a message you like.

As far as whether the default is appropriate or not, it is true the message is only sent when a non-member post is rejected, but depending on list configuration, it may not be sent for all non-member posts. Thus, a default which says the post is rejected because the poster is not a member could be equally problematic. I don't think the default is bad enough to warrant breaking 35 official Mailman translations to change it.