As a site administrators, I need to not accidentally register my site with the default 'admin@moodle.com' email address.

The Sites Registrations database is returning 51 records (data from 28th December with eduardcercos ) with the 'admin@moodle.com' email which means site administrators are not always changing this email, and they don't receive notifications, and in turn our site registration data is not accurate. 

Can we have a validation on that field in the registration form (Site administration> Registration) so that site administrators input a valid email address for their site administration, please?