Confirmation email sender

I wrote about confirmation emails here. I noticed I missed one thing, you can have problem about. Who is sending them?

Admin does that! Or better, confirmations emails are sent from email address that is set up in admin account. If you have more admins, it's primary admin, that is the first one, he was created when the Moodle has been installed. Change his email address and confirmation emails sender address should be changed too.