And here was my reply.

We’re writing to let you know that the group you tried to contact (no-reply) may not exist, or you may not have permission to post messages to the group. A few more details on why you weren’t able to post:

  • You might have spelled or formatted the group name incorrectly.
    No I did not.

  • The owner of the group may have removed this group.
    No they did not.

  • You may need to join the group before receiving permission to post.
    No I do not.

  • This group may not be open to posting.
    This answer sounds correct.

??? What is this about?

I honestly have no idea. That was an old error message I got a while ago trying to post to another thread. No idea how it got posted in the forum as a message from me here.