"Is there "good Mt. Rushmore" and "bad Mt. Rushmore"?"
"No idea, I've never been. Is there good coffee and bad coffee? Your turn. DC, despite what Google may have folk believe out there."
I've found that if when using the google interface, you reply to a post in a group to which you haven't subscribed, Mozilla uses your email ID as the default. In this case, the post you responded to was posted to several NGs. I presume you found the thread on one occasion by doing a search, and got the status you had in the group you found it in. If you find the post by navigating to AUE or some other group in which you have a nick (e.g. "Django Cat") and selecting the link you'll get that nick.
TOF