My inbox emails have disappeared from my iPhone email app

Hi Speckage,

Welcome to Apple Support Communities. It sounds like you are missing emails and have some questions. We will be happy to help!

First, are these iCloud accounts, or are they third-party like Google, MSN, or Yahoo? If you go to iCloud.com do they appear there?

Complete the following steps, testing after each one to see if the issue resolves:

• Quit the Mail app, and restart your iPhone as restarting can resolve many odd issues:
  • Close an app on your iPhone or iPod touch
  • Restart your iPhone
• If the behavior continues, remove your email accounts and add them back one at a time, testing after each addition:
  • Those steps are found under "Remove your email account and set it up again" here: If you can't receive email on your iPhone, iPad, or iPod touch
  • For iCloud, tap Settings > [your name] > iCloud, then turn Mail off. Wait a few seconds and turn it back on. Those steps and other helpful tips are found here: If iCloud Mail isn't working
• If you're still having an issue, uninstall the Mail app and reinstall it: Remove apps from iPhone

Let us know how it goes.

Take care.

If you had backup your device in iCloud then you can.

got to your web browser in desktop or laptop only. The. Go to https://www.icloud.com/mail/

you will find all your email.