Note that you get an e-mail either saying that your vote was accepted, or that your vote was rejected and why (bad GPG signature, unrecognized GPG key, mangled

Note that you get an e-mail either saying that your vote was accepted, or that your vote was rejected and why (bad GPG signature, unrecognized GPG key, mangled ballot, etc.) So if someone screws up, they know and can resend. Also, you're allowed to send in a second ballot which supersedes your previous ballot, up until the deadline. So if you change your mind during the voting period, you can update your selection.