Vireo is a clean, fast, GNOME-native email client with a calm three-pane layout, unified inbox, and support for OAuth accounts. Fast to open, effortless to read, and private by default.
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Evolution Alternatives
Evolution is described as 'Personal information management application that provides integrated mail, calendaring, address book and task list functionality' and is a very popular Email Client in the office & productivity category. There are more than 50 alternatives to Evolution for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best Evolution alternative is Thunderbird, which is both free and Open Source. Other great apps like Evolution are K-9 Mail, Betterbird, Microsoft Outlook and FairEmail.