My email is gone. Can I go back to a previous day, before my email disappeared?

No. Mail is not backed up.

First check Bin or Deleted folder.

If you lost the whole lot check Settings, Mail, Accounts, that the relevant account has Mail turned on.

Delete the email accounts from Settings, Mail, Accounts, restart the phone, then add them back.

Check as above

Plus if the folders are there but are empty, check if the account has "mail days to sync" setting

Settings, Mail, Accounts, and tap on the account

This very same thing happened to my husband yesterday. All of his emails disappeared from all folders????

My email icon has disappeared. How can I find it??

App library after your last home screen. Tap, hold, drag to a home screen

My email have disappeared. They come in and last 30 minutes then are gone. Also have problem where I can’t read them. Says they can’t load from server. They do come in to pc mail app.