USPS can't deliver my tax returns to Austin office

[mfroiz]

Hello, I live overseas and I have a two month extension to file. I sent my taxes on June 1st but until June 28th it has arrived in the U.S. Now the USPS couldn't deliver my returns because there was no recepient. So what can I do to reschedule a delivery to the IRS department when the address they give is a PO box one.

[DoninGA]

For the Internal Revenue Service Center in Austin, Texas use the street address -

Austin - Internal Revenue Submission Processing Center
3651 S IH35,
Austin TX 78741