Secure your company’s communications with Proton Mail — the business email solution trusted by over 50,000 organizations. With end-to-end encryption built in, your internal and external communications stay confidential by default. Proton Mail helps your business meet GDPR, HIPAA, and other compliance standards, while giving you full control over your data under strong Swiss privacy laws. Empower your team with encrypted email and calendar, support for your custom email domains, professional branding, and simple migration from providers like Google Workspace or Microsoft 365 — no IT team required.
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Google Workspace is an all-in-one cloud productivity platform developed by Google to help businesses manage communication, collaboration, document creation, and workflow automation from a centralized environment. The platform combines professional email, cloud storage, video conferencing, document editing, team messaging, scheduling, and AI-powered assistance into one subscription-based ecosystem optimized for modern work environments. Google Workspace includes applications such as Gmail, Google Drive, Google Meet, Docs, Sheets, Slides, Calendar, Chat, Keep, Forms, Sites, NotebookLM, and Gemini AI, enabling teams to work together seamlessly across devices and locations. One of the platform’s core strengths is its built-in AI functionality powered by Gemini, which helps users draft emails, summarize meetings, generate research insights, automate repetitive tasks, and improve productivity using contextual awareness from workplace data. Google Workspace also supports advanced collaboration features including real-time editing, appointment scheduling, eSignatures, document sharing, cloud storage management, and AI-assisted research tools. Businesses benefit from enterprise-grade security features such as AI-powered threat protection, data classification, endpoint management, Data Loss Prevention, secure access controls, and compliance support for enterprise environments. The platform offers scalable pricing plans suitable for startups, small businesses, enterprises, educational institutions, nonprofits, and government organizations. Google Workspace also simplifies data migration and onboarding with built-in migration tools and partner support for transferring emails, files, and business information securely into the cloud.
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Letterbox
Who has access to your emails? In the case of traditional emails, they can be viewed by you, the recipient, all email service providers, and potentially others. However, with end-to-end encryption, only the sender and intended recipients have the ability to read those messages. The iOS application Letterbox simplifies the use of end-to-end encryption, is compatible with a majority of email services, and utilizes the standard encryption protocol OpenPGP.
While Letterbox functions similarly to other common email applications, it highlights the security status of both incoming and outgoing messages, allowing users to differentiate between confidential and insecure emails.
As a free open-source email client on iOS, Letterbox is part of an ongoing research initiative at Freie Universität Berlin. Though still under development, users will soon be able to access the app on their devices through Apple's TestFlight platform, ensuring that secure communication is more accessible than ever. This advancement aims to enhance user awareness regarding email security while providing a user-friendly experience.
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Aster Mail
Aster Mail is a complimentary, open-source email service that offers end-to-end encryption for users seeking genuine privacy without cumbersome technical requirements. The encryption process occurs directly on your device, ensuring that our servers never have access to your messages or any associated metadata.
Utilizing the widely accepted OpenPGP standard with RSA-4096 keys, Aster ensures that you are not bound to a single provider; your keys can be used seamlessly with GPG, Thunderbird, or any compatible PGP client, and they are easily discoverable via WKD and public key servers. For communications between Aster users, the service employs a Signal-inspired X3DH and Double Ratchet protocol, providing enhanced forward secrecy.
Each subscription tier comes with encrypted email capabilities, support for custom domains, free aliases, protection against trackers, and unrestricted access across both web and desktop platforms. The complete codebase is available under the AGPL v3 license on GitHub, allowing for thorough audits, and it features a public warrant canary along with a clear vulnerability disclosure policy.
The free tier provides 10 GB of encrypted storage, along with 5 aliases and 1 custom domain. Paid subscriptions begin at just $2.99 per month, and all servers are conveniently located in Germany, ensuring compliance with stringent data protection regulations. Users can feel secure knowing their communications are protected by top-notch encryption standards.
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