A theme inspired by the Gruvbox theme for vim.
Download the theme here and choose install theme from Mailspring
Thank you Emmanual.
Would you be open to me forking this and making a light version?
Of course, do what you want 
i know this is a old post, But thank you. I just started using mailspring and needed this gruvbox theme to finish my total theme.
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I’m not using mailspring anymore. So maybe It will need some updates. Don’t hesitate to fork and make all modifications you want 