Polymail might be a bit more popular than Unibox. We know about 1 link to it since March 2021 and only 1 link to Unibox. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
UniBox This is good app, unfortunately, after looking their twitter account, looks like they have stopped the development in 2017. Source: over 2 years ago
Polymail - This one is a lot like Twobird but with a lot more features. It's a different type of email client. It's really cool, but the Windows version is just a web app. It's available on iOS as well. Source: over 2 years ago
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