iPhone 12 Pro Max Upgraded to iOS 14.4 and all emails disappeared!

[thecore762]

I upgraded my iPhone 12 Pro max to the latest version of iOS 14.4 few days ago and I noticed all my emails vanished! Both my iCloud emails and gmail emails, all gone, I logged in my gmail account and the emails are gone there too! I checked the deleted folder, the archived folder and nothing!
Anyone knows what I can do?

 

[Significant1]

I could understand if you had to go to settings>mail>accounts and reenable them or enter password. I tried that. But if they are also gone on webmail, then you have another problem and it is hardly related to 14.4 upgrade.