The best alternatives to Boxy are Polymail , Airmail, and Kiwi for Gmail. If these 3 options don't work for you, we've listed a few more alternatives below.
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Polymail is the email platform for teams. By combining email with real time collaboration and integrating it with your team's other tools, Polymail allows everyone to work together seamlessly, move faster, and be more productive.
Distinct from what Gmail uses in the browser, we designed a powerful engine that allows multiple accounts to be used together with 100% fidelity and no conflicts. It works with Google Drive, Docs, Sheets, and Slides as well.
Our mission is to make people more productive by enabling technology to millions. We strive to create the best experiences on mobile and desktop for those who want to be more productive.