No, don't e-file after you have already mailed your tax return. It will either be immediately rejected or delay the processing of your refund.
Attempting to e-file your return, after mailing them, may result in the IRS rejecting the e-filed return due to them thinking someone already filing using that name, social security number and birthdate.
Additionally, if there is a refund due, submitting two returns will slow down your receiving your refund because a person will need to investigate why two returns were received.
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