all of my email has been deleted on my iCloud account. how do I recover them?

See the article Delete and recover emails in Mail on iPhone - Apple Support

JulieSil Said:

"all of my email has been deleted on my iCloud account. how do I recover them?: My iCloud emails disappeared. How do I recover them?"

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Use a Computer:

The best method is to troubleshoot this using a computer, as it would be more user-friendly doing so. Open the Mail app, seeing they pop up. Also, look in the Deleted and Archived folders (if applicable).