Bulllshit. Jimmy Carter questioned the use of mail in voting 20 years ago. And all of his concerns are still valid today.
It's 2023, there have been a lot of improvements. Concerns then are not valid today.
#1 Computer systems are vastly improved. Each individual ballot package is bar/QR coded not only to the individual, but as a uniquely serial numbered package.
#2 Much closer data systems between the USPS and the election office on valid addresses.
$3 Complete tracking of the mail-in ballot from request, to processing, to mailing, to return mail-in, to security validation.
#4 Ballot scanning technology where the security envelope is scanned which facilitates the examination of election teams in performing security evaluations. Not only is the ballot envelope scanned systems present side-by-side comparisons of the envelope and their current voter registration record and signatures. Some including all past mail-in ballot signatures and in my state a display of my DMV signature.
#5 Because each ballot package is tracked as a unique entity, there is instant available to election offices on the status of a voter. Such as do they have an outstanding mail-in package, preventing both mail-in and in-person duplicate votes being caste.
#6 Not only are we seeing improvement in the technology, but changes in the information that is submitted as part of multi-factor authentication as part of the security process. This includes such things as Date of Birth, full or partial Social Security Numbers, and/or State issued ID numbers (like drivers license), or the individuals unique Voter Registration Number.
All this prevents the "absentee voter fraud" that many feared in 2005 when the Carter Commission issued it's report close to 2 decades ago.
Welcome to the modern world where today you can track it all the way from beginning to end.
WW