The best alternatives to Isotope Mail Client are Polymail , Airmail, and Nylas. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
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.
AirJam's uploader component lets you create upload functions to your React.JS project with just a single Tag All you have to do is to create a new bucket from AirJam. Currently supports Firebase Authentication for serverless auth, more to come
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