Comment 2 for bug 114384

Note that the bug mail sent out by Launchpad set the envelope sender to a separate email address (<email address hidden>), and also set the Errors-to: header.

The problem account appears to be https://launchpad.net/~nomorespam (which has its email addresses hidden -- will need admins to check this) who is a direct subscriber of bug 71657. Looking at the ubuntu-bugs mailing list archive, I find the following message for that bug:
    https://lists.ubuntu.com/archives/ubuntu-bugs/2006-November/343736.html

Now that message claims to be from an @gmail.com address, but the errors come from @shell.visi.com, so it is possible that there is a broken forwarder somewhere.