Like, how are you imagining this mail-in ballot being dealt with? Do you think that anything that gets mailed to the board of elections is magically tabulated by elves without checking it against any official lists? The votes aren't even visible on the outside of the ballots! The biggest risk is actually from throwing ballots away, but that would be done by government officials, not individual people, and again, that could more easily be done by hacking voting machines. - If you've never googled how easy it is to hack the voting machines, get on that. I expect better from random internet people - most people who spend this much time on the internet are already aware that voting machines represent the major election fraud threat.