You can e-file your 2020 1040X return this year. In previous years they had to be mailed. VolvoGirl mentions the date (Jan 24) the e-filing will begin this year in the post above.
Here's an article that will explain more about e-filing your 1040X.
Can I e-file my 1040X to amend my return? - Intuit
@slawso
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