“Far from being a gateway to rampant fraud, when done correctly mail-in balloting is more secure than in-person voting. Even after an election in which 46 percent of votes were cast by mail—a huge increase that threatened to overwhelm election offices—there is nothing more than anecdotal evidence of problems with the process. In places where mail-in voting has been the norm for years, like Oregon, there is scant evidence of fraud.
Despite what critics claim, “no-excuse absentee voting still must undergo the same rigorous process to ensure ballots are legitimate, including ballot tracking measures and signature verification,” write Hyden and Greenhut (a Reason columnist) in the new R Street study. “These safeguards are highly effective, too.””
https://reason.com/2021/02/18/limiting-mail-in-voting-wont-make-elections-more-secure/