Seems when we read online what matches our bias we deem it credible....when it doesn't it's nothing but misinformation. That's why we will never get back to one Country. As I remember, to sign up for a mail in ballot I had to physically show up, present a valid ID and fill out a form. One time visit. How hard is that?

I don't like the idea of voting by mail, as voting in-person is good for a citizen's soul. I can live with voting by mail, but only in places where "ballot harvesting" is not legal. Do you want political operatives canvassing your neighborhood for mail-in ballots to collect and deposit with the voting authorities? I don't. If you can't see that such a system is ripe for fraud and abuse, I don't think you are seeing straight. Voting by mail should be just that - by mail.

So I guess this question can not be answered -
So who going to check when, the millions of “Mail in Votes” that will be dump just before closing time to be signature checked and verified?

Widespread is a red herring and you know it. Corruption was not "wide spread" when the election was stolen from Nixon in Texas and Chicago. If the election is close it doesn't have to be widespread. But it damn sure was in Michigan.

Overall, state records show 10.6 percent of the precincts in the 22 counties that began the retabulation process couldn’t be recounted because of state law that bars recounts for unbalanced precincts or ones with broken seals.
The problems were the worst in Detroit, where discrepancies meant officials couldn’t recount votes in 392 precincts, or nearly 60 percent. And two-thirds of those precincts had too many votes.
“There’s always going to be small problems to some degree, but we didn’t expect the degree of problem we saw in Detroit. This isn’t normal,” said Krista Haroutunian, chairwoman of the Wayne County Board of Canvassers.

And don't you remember the fiasco in Broward where the late count magically found thousands of more votes for the Democrats? It was impossible to due accurate forensics in that county.

And a couple of Democrats agree that when it comes to voting, where there is way to cheat, then there is a will.

Flashback! Jerry Nadler in 2004: “Paper ballots are extremely susceptible to fraud - YouTube
Debbie Wasserman Schultz says Mail in ballots have wrong written all over it. - YouTube

If you have don't have an iron clad system that can reconstruct the vote accurately then these controversies will keep on happening. And if you nationalize mass mailing of ballots , what happened in Paterson NJ, will be replicated many times over.

But can't we at least agree that there has to be a better way to validate mail in ballots than signature verification? As stated before, I could support large scale mail in voting if the proper safeguards were in place.

Not to worry, lots of fake IDs available.