BCC an additional email on PMPro admin emails. Works with PMPro Approvals emails.

my_pmpro_email_headers_admin_emails.php

/*
Add bcc for PMPro admin emails
*/
function my_pmpro_email_headers_admin_emails($headers, $email)
{	
	$approval_admin = array( "admin_approved", "admin_denied", "admin_notification" );
	
	//bcc emails already going to admin_email
        if( strpos($email->template, "_admin") !== false || in_array($email->template, $approval_admin) )
	{
		//add bcc
		$headers[] = "Bcc:" . "otheremail@domain.com";		
	}
 
	return $headers;
}
add_filter("pmpro_email_headers", "my_pmpro_email_headers_admin_emails", 10, 2);