I Know This Is A Long Shot, But Has Anyone Ever Tried To Or Been Successful At Getting An Email That Was Deleted From About 2-3 Years Ago? Something You Didn’t Need Back Then, But Now Can Be Very Useful?
Mails are deleted after 30 days from iCloud server see this article https://support.apple.com/kb/ph2651?locale=en_US
If you had ever archived the mails they remain in archive folder see this article https://support.apple.com/kb/ph2651?locale=en_US