Mailspring is an open-source mail client built on the modern web with Electron, React, and Flux. It is designed to be extensible, so it's easy to create new experiences and workflows around email. It is a fork of the https://alternativeto.net/software/nylas-n1/ and is developed by one of the original author of the latter. In fact, it replaces the Nylas Mail JavaScript mail sync (client-sync package) and the Electron "worker window" with a new, high performance codebase written in C++ and based on Mailcore2. making the Electron application just the UI layer. It comes packed with powerful features like Unified Inbox, Snooze, Send Later, Read Receipts, Link Tracking, Templates and more although if you would like to use features like Snooze, Send Later, Send Reminders and Read Receipts often, you'll need to purchase a subscription to Mailspring Pro within the app.
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