Hi Joe, in light of recent changes in mojoPortal, I suggest you change the third paragraph of Data\MessageTemplates\en-US-NotifyAdminofNewUserRegistrationMessage.config from:

You are receiving this message because your site is configured to require approval before newly registered users can sign into the site or because you have configured notification of new user registrations.
If you no longer wish to receive these notifications, you can disable it in your Web.config file by making the following setting false:
<add key="NotifyAdminsOnNewUserRegistration" value="false" />

to:

You are receiving this message because your site is configured to require approval before newly registered users can sign into the site or because you have configured notification of new user registrations.
If you no longer wish to receive these notifications, you can disable them by navigating to Administration, Site Settings, Security, and removing your email address from the "Email Addresses(es) For User Approval Notification" field..

Jamie