The IRS does not send notifications.
You can check for a transcript here after about 3 weeks to see if your return was processed. (You should have used a mailing service with tracking.)
https://www.irs.gov/Individuals/Get-Transcript
If you are referring to your AGI that you need to verify your identity to e-file, because you filed so late, your AGI from your 2016 tax return may not be in the system to allow you to e-file your 2017 return. Try your AGI, and then try zero, and if neither of those work, you will need to mail your 2017 tax return as well.
