Changing Sender in Registration emails

When CB sends out an email message from within its new user registration feature, the sender is always listed at "Root User". How may I change that?

You can change the Registration Email Name, Registration Email Address, and Registration Reply-To Email Address within CB > Configuration > Registration otherwise it will use whatever you've set in Joomlas global configuration mailer settings.

This doesn't seem to work. The first attachment shows the "Community Builder: Registration" page, the second shows the global mail settings, and the third shows a confirmation email sent by the registration process.

The From field in that message is root@localhost, where it should be otherwise

"Root User" is being displayed because that's what you saved that contact as in your contacts. Check the raw email header to review the actual from name and address. "Registration Email Address" and "Registration Reply-To Email Address" also should not be a comma separated list of addresses. Only a single address is supported in those parameters.