When we send invoices through to palace to document flow, quite often some invoices do not arrive in palace. As we are sending 20 - 80 invoices at a time and only 2-5 invoices to not show up. There is no easy way of knowing what has not shown up in Palace and we are unaware that invoices are missing until we receive a reminder notice from the supplier. It would be great if an email failed to reach palace there was an auto reply that the message failed to send.