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Right-click Finder and choose Go to folder.Delete (or isolate) a few Mail Data files: Envelope Index, Envelope Index-shm, and Envelope Index-wal.Remove (or isolate) some mail preference files from your User Library: and.Quick Tips Follow These Quick Tips To Help Get Your Mail App Working Again In macOS High Sierra

If you updated to macOS Mojave and are having mail problems, please see this article on Mail App Problems After Upgrading to macOS Mojave.
