Fetched POP3 mail should remain in Deleted.
When fetching email with a 3rd party client using POP3 with a setting to delete mail from the server, the convention is to move that mail from Inbox to Deleted folder. However, the mail is fully deleted from server and not recoverable by any means (from Mobile Web anyways). Conversely, when this same mail client SENDS POP3 mail, it IS copied to the Sent folder. Please stop ghosting all my received messages.