evidence: Most states require voters to sign an affidavit on the outside of the envelope containing the mail ballot to affirm identity and eligibility to vote. Make sure you sign that envelope. Some states verify your ballot by matching the signature from the voter registration form. Others use the signature on file with the government, such as the signature on a driver’s license. Find out the rules where you live. Depending on the state, you might also need a signature from a witness, or a notary. [...] Just 19 states have a process requiring election officials to notify voters if problems occur with their ballots and offer an opportunity to fix them, according to Votingrightslab.org. According to an analysis by the National Vote at Home Institute, a nonpartisan group that advocates for states to make it easier to cast ballots from home, 47 states and the District of Columbia now have online portals that allow voters to track the status of their ballots every step of the way.