Sure you don't have cyberwarfare, but you do have old-fashioned vote selling and coercion. Postal voting denies many women a free vote.
How many? Is it more than the number of people who can't vote in person on election day due to work or inability to travel to voting places? If it's not, vote-by-mail still wins in aggregate. If it is, then it sounds like there's a serious domestic abuse issue in the broader society that needs to be addressed.