One of the most popular email services, Gmail keeps track of all your emails with threaded conversations, tags, and Google-powered search to find any message you need.
Add valid email submissions to the table and reply with their IDs.
Turn emailed entry requests into database rows, with a reply that confirms the ID or tells the sender what to fix.
Turn scanned source pages into text and flag uncertain entries.
Get the text from emailed scans and see which words need your review. Find the reply in the same email thread.