Change the admin email for all Paid Memberships Pro admin emails.

my-pmpro-change-admin-email.php

<?php
/**
 * Change the email address for all admin related emails in Paid Memberships Pro.
 * Follow this guide to add custom code to your WordPress site - 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 ) {
	$user_email = 'memberadmin@someemail.co';
    }
	
	return $user_email;
}
add_filter( "pmpro_email_recipient", "my_pmpro_change_admin_to_email", 10, 2 );