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Whaller might be a bit more popular than Polymail. We know about 1 link to it since March 2021 and only 1 link to Polymail. 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.
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
I suggest you try Whaller. Their equivalent to Slack channels have tabs which include messages/posts, a file manager, a task kanban, videoconferencing and a few other useful stuff for what you need. Source: almost 3 years ago
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
Yammer - Yammer is a leading enterprise social network used by more than 200,000 companies worldwide, including 85% of the Fortune 500, to get work done smarter and faster. Sign Up Today.
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Slack - A messaging app for teams who see through the Earth!
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Samepage - Samepage facilitates communication, project management, meetings, online collaboration, and more by combining team chat, video calling, screen sharing, task management, and real-time team document collaboration in a single collaborative workspace.