That doesn't sound much less secure than how I voted, as an expat. I did the following: 1) Applied for a ballot by email, using a scanned Federal Post Card Ap

That doesn't sound much less secure than how I voted, as an expat. I did the following: 1) Applied for a ballot by email, using a scanned Federal Post Card Application (FPCA) sent to the county clerk of the county I last resided in. 2) A ballot was sent to me by post. This is just a big piece of paper with some stuff printed on it. 3) I check the boxes I want to vote for. 4) I mail back my ballot. Overall it doesn't seem much harder to spoof the existing process, since there's no verification of who sent back the ballot. The only security is that there might be various codes (or bar-codes) on that paper ballot which you'd have to know something about to fake.