Inbox
Every message lands in your inbox first. Nothing is lost, even when an email does not arrive.

Read a message
Press a name to open the message. You see every answer and every file.

Answer
Press Reply by email. Your own mail app opens with the shopper's email and a subject. The message is marked as answered.
Sort your messages
Use Mark as answered, Mark as done, This is spam or Mark as new. The tabs at the top show each group. Search finds words in any message. Pick one form to see only its messages.
Download
Press Download as a spreadsheet. You get every message in one file. You can download them any time, also after you stop your plan.