<ul><li>Postbox, a longstanding email client, has been acquired and shut down by eM Client, a leading email platform for Windows and macOS.</li><li>eM Client, despite its cross-platform status, is not well-known among Mac users and is suspected to be a Windows app clumsily ported to macOS.</li><li>eM Client recently gained iOS and Android clients, and there is a migration guide available for Postbox users.</li><li>Postbox was based on Mozilla's Thunderbird email app, which provides native Apple Silicon code and additional features.</li></ul>

Postbox Discontinued

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