Yes, you can still e-file even if you are required to mail Form 8453 and Form 8949 to the IRS.
IRS regulations require mailing Form 8453 (U.S.
Individual Income Tax Transmittal for an
IRS e-file Return), Form 8949 (Sales and Other Dispositions
of Capital Assets) with other supporting documentation, when e-filing
and using summary reporting methods to record large quantities of
stock transactions.
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