The best Group Chat alternative to eM Client is Delta Chat, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to eM Client and three of them are Group Chat Apps so hopefully you can find a suitable replacement. Other interesting Group Chat App alternatives to eM Client are Mailspring and Spike.
Provides a chat experience over email, with all messages and contacts stored on user devices, open source code, group media support, and compatibility with any provider. No central servers, no tracking, works without SIM, and can be used by anyone just via email.
Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.
Transform your email inbox into a collaborative workspace with Spike. Enjoy integrated chat-like emails, tasks, collaborative notes, and group projects. Seamlessly manage multiple accounts, organize priorities, and schedule meetings across devices.
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Mailspring lacks way too many features, compared to even emClient 7, let alone em Client 8. Lack of support for templates and quick replies, horrible dark theme support etc.