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Try rebuilding your mailboxes to see if this fixes your problem Here is how: See also: Mac Mail App: Gmail Not Working? Fix Rebuild If you are using macOS High Sierra or earlier: Open the App Store and click Updates.If you are using macOS Mojave or later: Go to System Preferences and Software Update.When you update the macOS software on your Mac, Mail will also be updated.

See also: Email Attachments Won’t Open in Safari on Mac Update If restarting does not fix your problem, then try the steps below: Before you do anything, simply restart your Mac. After trying each step below, test Mail again to see if you can open it.

See also: Mac Mail App Opens Itself Randomly, Fix
