I was on a plane, and turned on Airplane Mode. I spent the flight replying to a bunch of emails. When I arrived at my destination, I turned off flight mode. Many new emails came in; but at first none of the emails in the outbox went out. Then, some hours later, I went back in to email, and a few of them started to go out. However, there are still seven messages stuck in the outbox. When I touch Send outgoing emails, nothing happens. I've tried shuttng down, pulling the battery, etc. to no avail.