That's correct. Windows doesn't send e-mails. You need an e-mail program and you need to do some settings in it.
After upgrading to Windows 10 you have 31 days to go back. A refcent Microsoft blog entry says
"That being said, we would encourage everyone to upgrade because Windows 10 is the best Windows ever – familiar, safer, faster, and full of innovations. After any upgrade, you can easily go back to your prior version of Windows within 31 days if you choose. We do this by keeping a full copy of your previous operating system on your device – including apps and settings – for the first 31 days following your upgrade. At any time during the first 31 days, you can go to “Settings->Update and Security->Recovery and Uninstall Windows 10” to return to your prior version of Windows."
Usually it goes well. Sometimes it doesn't. Then you do a clean reinstall of your OS from the original disks.
But do I understand correctly that you jumped into Windows 10 before researching yourself how to go back again if necessary?
I want windows 10 off my computer. cannot send emails and can't save to drafts. this thing is worthless. the sooner I get it off and get my old windows back the better. helpless-helpless