The IRS does not send any sort of letter or message to acknowledge that you sent an extension request. Your proof that you made a payment will be your own bank or credit card statement. When you prepare your tax return, make sure you have entered the payment you made when you sent in the extension form.
When you requested your extension you were supposed to pay your estimated tax due. Did you enter the payment you made into your tax return? Go to Federal>Deductions and Credits>Estimates and Other Taxes Paid>Other Income Taxes
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