arm_change_registration_email_notification_to_admin

This Filter provides access to modify email message before new user registration email will get sent to admin.

Hook Type: Filter
Usage:
add_filter( 'arm_change_registration_email_notification_to_admin', 'your_function');
function your_function($message) {
    //$message Email Content
    $message .= ' If you have any query, please contact site administrator.';
    return $message;
}
Parameters:
$message
Email Content