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Hi, I'm Mr.med. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
I'm sorry about the issue, please open the App Store app. Tap the search icon and type Mail in the search field. Locate the missing Mail app icon and tap the cloud icon next to it to download.
Let me know the results
Has everything worled out, Do you still need help please?
if you need further assistance please reply back to me and i will gladly continue to help