Although Fedex Express Saver service is not designated by the IRS to meet the "timely mailing as timely filing/paying" rule for tax returns and payments, it is quite acceptable to send your tax return using Fedex Express Saver.
You only need to use USPS mail or one of these services to have proof of timely filing. As you have filed well before the deadline, the IRS will receive your return in time.
DO NOT send your return again using one of the designated service as this would cause confusion..
Please read this IRS document for more information.
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