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Stalwart Mail vs. ProtonMail: A Technical Deep Dive into Modern Email Security & Deliverability
For organizations and technically-minded individuals prioritizing privacy, ProtonMail has long been the gold standard for End-to-End Encrypted (E2EE) email. However, as organizations scale, the desire for data sovereignty and infrastructure control often leads engineering teams to explore self-hosted solutions. Enter Stalwart Mail, a modern, open-source, and highly scalable mail server written in Rust. Its robust…
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Beyond the Walled Garden: Why Matrix and Sovereign Infrastructure Outpace Signal in the Chat Control Era
For over a decade, enterprise security teams and civil society organizations have looked to Signal as the foundation for secure messaging technology also used in WhatsApp and Google RCS chats. In 2015, the threat model was defined by passive, over-the-air dragnet surveillance. Against that specific network-layer threat, Signal’s implementation of the Double Ratchet protocol over…
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Matrix for E2E Encrypted Chat in the “Chat Control” Age
In an emergency session of the European Parliament on July 9, 2026 right before the summer recess, Chat Control 1.0 was approved. The motion restored the authorization of Big Tech companies, including Discord, Google, Meta, Microsoft, and Snap, to voluntarily scan & moderate non-E2EE messages on their platform using dragnet surveillance tools – which would…
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Sovereign Email Simplified: Insights from Deploying Stalwart Mail
Deploying a self-hosted email server used to be a daunting task involving complex configurations across Postfix, Dovecot, and SpamAssassin, often feeling like a full-time job. However, modern solutions like Stalwart Mail have dramatically simplified this experience, offering an all-in-one, secure, and highly performant email server. In this post, we’ll share our technical insights and “gotchas” from integrating…