Postal voting should be the exception and not the rule. The right to postal votes should only be reduced to necessary cases, for example if someone cannot go to the polling station.
With regard to the current situation in the United States, it should be recognized that around 50 percent of Americans are behind the incumbent Trump. So he is by no means an accident in history.
Postal voting is considered unsafe and easy to manipulate. In the run-up to the US elections, concerns were expressed that the election could be manipulated by not counting mail-in votes or by suddenly adding new ones.
Simple solution: abolish postal voting. Voting takes place on election day. At the polling station. Under supervision. With few exceptions.