You wrote: "How do I confirm the IRS received my 2018 return. My return was printed and mailed from overseas."
Is this one you're filing late and mailed recently? Or are you asking about one you mailed last year?
It won't help now, but normally it's best to mail by a method that has tracking.
If a check was enclosed, did the IRS cash the check?
In "normal times" you'd be able to phone the IRS and ask if it was received. But their call centers are essentially closed down for the time being due to the Coronavirus situation. Hopefully, they will open up again in the not-too-distant future. Likewise, most correspondence and processing of paper returns is shut down.
If you're still overseas, the IRS has an International Taxpayer Service Call Center for folks who are out of the country, but it would be shut down in the same situation right now.
https://www.irs.gov/help/contact-my-local-office-internationally
So you're kind of in limbo for a while, unless someone else has a suggestion to add to this thread.
