I don't have any evidence of fraud in regards to mail-in ballots, but again, the fact that it hasn't happened in the past does not mean that it can't happen at all. Look, here's the strongest case that I've been able to find that for potential fraud in the 2020 presidential election:
(Rudy Guiliani makes the case).
Here's another factor to consider. One thing I will be looking for is the rejection rate of mail-in ballots because there are reports that hundreds of thousands of these types of ballots usually get rejected because of errors. If the rate of rejection for the 2020 election for a particular state is less than that of previous elections involving mail in ballots, then that alone would be questionable.
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In the 2018 General Election, the number of mail-in ballots topped 42 million, with about 30 million returned. But rejection rates also increased dramatically as election officials tossed out more than 425,000 mail-in ballots -- about one in every seven ballots returned. Again, signature issues were cited for the largest portion of rejections."
750,000 mail-in ballots were rejected in 2016 and 2018. Here's why that matters.
For instance, if any of the highly contested states, like Pennsylvania, had little to no rejected mail-in ballots (esp. if it was for a particular candidate), wouldn't that be suspicious?
*Also, please keep in mind that I'm an Independent. I don't "support" either of your parties, but rather I support certain policies. I vote for whoever has the most policy I can agree with irrespective of their party.