pmpro-change-admin-to-email-address.php

<?php
/**
 * Change the admin email address for Paid Memberships Pro emails.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_change_admin_to_email( $user_email, $email ) {
	if ( strpos( $email->template, '_admin' ) !== false || strpos( $email->template, 'admin_approved' ) !== false || strpos( $email->template, 'admin_denied' ) !== false || strpos( $email->template, 'admin_notification_approval' ) !== false ) {
		$user_email = 'memberadmin@someemail.co';
	}

	return $user_email;
}
add_filter( 'pmpro_email_recipient', 'my_pmpro_change_admin_to_email', 10, 2 );