Why not just simple go through the /wp-includes/wpmu-functions.php file and replace it with the address you want in there? That's what is suggested up above.
I've already done that last time. That got me to this point:
http://mu.wordpress.org/forums/topic.php?id=1630&replies=25
Following andrea_r's suggestion in that thread I've reinstalled the whole thing with the latest nightly build, but there's no change.
This is not WordPress, it's WordPress Multiuser.
Point taken. I've edited my previous post accordingly.
Where's trac?
Here some incomplete answers to the bug tracking questions:
* Is VHOST true or false
don't know, have to study on it
* Is the path to your WordPress? MU install "/" or some directory?
No, it at the root of my account, but not at the root of Bluehost's server.
* Anything in the error logs? If you didn't get a welcome email, check your mail logs.
There's no error in this case, just unwelcome behavior.
* Does the information in wp_blogs, wp_users and wp_site match your blog, user and site?
don't understand the question. Match in what respect?
* Mention the version number, SVN check-in number or the date you downloaded the snapshot.
What snapshot?
Other things to do:
* Read the README.txt file. There are important instructions there on how to configure your web server.
I've read it!
* Check the following: wp-config for $base, database tables wp_blogs and wp_site match the URL you're using.
Don't understand the question, but doesn't seem relevant to the email address problem
* If your new install doesn't work, you should debug wpmu-settings.php to figure out where it's going wrong. Use print, print_r and error_log to dump variables, especially $blogname.
My install does work. The system is just using the wrong e-mail address.
* If it did work, and then it broke, what did you do last?
It's a consistent problem that appears after a fresh reinstall with the latest nightly build.
* Check if your bug hasn't been already fixed:
Checked for as far possible
* Search closed tickets to see if your bug was reported and fixed.
Checked
* Check the forums at http://mu.wordpress.org/forums/ for relevant threads.
Checked. Posting on one now.