[8bitsrule]

>The envelope is sealed and signed by the citizen.

Alas, the signature must reasonably match one on file (from somewhere ... presumably a state ID) or the ballot may be rejected. Since human signatures can vary wildly for reasons, this non-deterministic feature requires a human guess for -each- ballot. No mechanism to dispute that decision.

[saulpw]

Mine has been disputed several times (because it changed due to name change and wasn't updated). There is a very clear mechanism to dispute that decision, and in fact that's why they ask for your phone number and/or email on the envelope--so when they want to dispute it, they have a way of contact for you to do what's necessary to make the ballot count (provisionally, only if the race is close enough for your vote to matter).