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The IRS does not send any acceptance letter after they receive a Form 4868 Request for Extension.
You can go to the following TurboTax website for the status of the e-filed extension at no charge. If the extension was received and accepted, there will be date/time stamps for when it was received and for when it was accepted. Click on the Print this page icon in the upper right corner of the screen - https://shop.turbotax.intuit.com/efile/efile_status_lookup.jsp
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