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You should upgrade or use an alternative browser. Since installing 18.2 yesterday, I noticed there is no longer the option to offload and reinstall the Mail app.
My Mail app was approaching 1 GB of space - while having probably no more than 10 emails. In order to free-up the cache I deleted the entire account (as I have done many times). When I put everything back together, the entire 1 GB remained.
Does anyone have any ideas how I can reduce the size of the Mail app? In the past, a simple deletion and reinstall did the trick.