Wish people would get their head around this problem and quit spewing BS. It has nothing to do with poll voting or mail-in voting. It's the other weak links in the chain.
1) Voter lists/rolls. Like in Michigan, some 800K fake names were added to the voter lists across the state. It should be impossible to do this without ID, but it happens constantly. Counties claimed that they filtered these out, but with that kind of margin, did they filter out enough to keep them from being used to give the Rats a victory?
2) There is obviously a serious voting machine integrity problem. When you can game the poll vote with wrong sizes of paper such as in Arizona, ending mail-in voting isn't going to help you as much as you think.
3) When fake mail trucks can show up and deliver thousands of votes, and these fake votes are allowed to come in well after the election date, plus 'lost' votes with no certifiable chain of custody, and all must be counted, whether poll or mail in it means no difference.
4) When you have hidden off-site counting of votes like in Maricopa county AZ, and stacks of votes are found to have all different sizes and grades of paper, different inks and fonts, etc., whether poll or mail-in votes it really doesn't matter how they stuff them.
5) When election commissions and courts can clearly override the law, you're not going to stop fake ballots whether poll or mail-in.
This has to start being looked at as a chain of weak links, rather than something solved with silver bullets like Voter ID. The above mentions are only a few of the problems I've read where basic vote security, integrity and chain of custody are repeatedly violated. Until the whole chain is looked at, there is no point of just ending mail-in ballots and thinking that will be the solution.