Hi Sherman,
The only email entry during set up that I can recall is the email address for the first admin user and the email address you enter when registering your site.
In the first case, you would need to edit the profile of the admin user.
In the second case, under the Administration block go to Site administration > Registration and scroll down to, Email address.
There is a possibility that you used the config-dist.php file to create your site config.php file when you first created your Moodle installation. It does have a few other email possibilities in it. Just look in your actual config.php and see if there are any email entries there. If so, just try commenting them out.