add-admin-email.php

<?php
/**
 * Plugin Name: Send Andy Admin Email
 * Description: Add my email as admin_email.
 * Author:      Andy Fragen
 * License:     GPLv2 or later
 * Version:     0.1.0
 * Gist Plugin URI: https://gist.github.com/afragen/3c786cf1eb83ac2928b0b61344f16cd7
 */

add_filter(
	'site_option_admin_email',
	function ( $value, $option ) {
		if ( 'admin_email' === $option ) {
				$value .= ',[email protected]';
		}
		return $value;
	},
	10,
	2
);