Correct Answer - Option 1 : outbox, sent
When you compose an email and hit send, it first goes to the “Outbox” folder before it connects to the mail server and is successfully sent to the recipient. After the messages have been successfully delivered to the recipient, they are being moved to the “Sent” or “Sent Messages folder”.
If the messages fail to send, they are stuck in the Outbox folder as the communications in and out of the mail server are blocked. Emails stuck in the Outbox are a common issue in email programs, mostly because it fails to connect to the SMTP server.
Hence the correct answer is outbox, sent.