Do you have an e-mail that specifically states your return was ACCEPTED by the IRS? If do you, then your e-file was successful. Nothing has to be mailed. If you do not have such an e-mail, then either you never finished the e-filing process, or some other issue has occurred that needs to be fixed by you. When a successfully e-filed return is rejected by the IRS, the rejection e-mail helps you to fix the problem so you can resubmit your return electronically.
