Multiple Admin Email Addresses allows you to replace the blog's admin email with a comma separated list of admin emails
Easily send a simple custom email with an attachment from the WordPress administration screen.
Turns off the notification sent to the admin email when a new user account is registered. Works with WP >= 4.6.0.
The Hack Repair Guy's Admin Login Notifier notifies you the moment an Administrator user logs into your WordPress dashboard.
This plugin disables the email sent to the site admin each time a new user creates an account.
Allows to edit From Name, From Email, admin emails and send test emails
