my_pmpro_email_headers_admin_emails.php

<?php
/*
Add bcc for checkout emails
*/
function my_pmpro_email_headers_admin_emails($headers, $email)
{		
	//bcc checkout emails
	if($email->template == "membership_expiring" || $email->template == "membership_expired")
	{
		//add bcc
		$headers[] = "Bcc:" . "otheremail@domain.com";		
	}
 
	return $headers;
}
add_filter("pmpro_email_headers", "my_pmpro_email_headers_admin_emails", 10, 2);