Right now, I often have emailed receipts fail to scan for various reasons. However, when that happens, I get virtually no info about what the failed receipt was. Thus if I emailed 5 receipts and one failed, I have to reconcile which 4 succeeded to figure out the failure. Ideally, you would either include the entire failed email in the failed receipt object on your app, or you would reply back to the email I sent that failed to scan so I can see it in my email client.