Open Source Email Services

Proton Mail

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Proton

Proton Mail is an end-to-end encrypted email service founded in 2013 at CERN by scientists Andy Yen, Jason Stockman, and Wei Sun. Headquartered in Geneva, Switzerland, it uses zero-access encryption — meaning Proton itself cannot read your emails. All infrastructure is located in Switzerland (including a former military bunker under 1,000 meters of granite). Proton Mail is open source, independently audited, and serves 100+ million users across Proton's ecosystem.

Kolab Now

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Apheleia IT AG

Kolab Now launched in 2013 as a public service built on the open-source Kolab groupware platform, operated by Apheleia IT AG (formerly Kolab Systems AG) from Bern, Switzerland. It provides a full groupware suite — email, calendars, contacts, tasks, notes, and file storage — hosted entirely in Switzerland under Swiss privacy law. The company is a founding contributor to Collabora Online and champions software freedom as a core principle.

mailbox

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mailbox.org

Mailbox is a robust email service designed to meet the needs of privacy-conscious users and businesses in Europe. Hosted in EU data centers, it ensures that your emails remain secure and compliant with GDPR privacy regulations. Mailbox offers end-to-end encryption, safeguarding your communications from unauthorized access. Users can benefit from custom domain support, making it ideal for personal branding or business use. The service also integrates seamlessly with calendars and tasks, providing a comprehensive productivity suite. With two-factor authentication options, Mailbox prioritizes your security without compromising on user experience. The platform is ad-free, ensuring an uninterrupted email experience, and utilizes an open-source email client for transparency and flexibility. Mailbox is perfect for individuals, freelancers, and businesses who value privacy and data sovereignty. The service offers various pricing tiers to accommodate different needs, from basic personal accounts to more advanced business solutions. By choosing Mailbox, users can rest assured that their data is stored and managed within the EU, benefiting from stringent data protection laws.

Migadu

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Migadu

Migadu is a email provider from Switzerland that only charges per usage (emails sent, storage, ect).

netim

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netim

Netim offers a robust email service designed for individuals and businesses seeking reliable and secure communication solutions. As an EU-hosted service, Netim ensures that all email data is stored within Europe, providing users with the benefits of GDPR compliance and enhanced data sovereignty. This service is ideal for users who prioritize privacy and need a dependable email platform that aligns with European data protection standards. Key features include customizable email domains, advanced spam filtering, and seamless integration with popular email clients. Netim's email service is particularly suited for European businesses, privacy-conscious individuals, and organizations that require compliance with EU regulations. The pricing model is structured as a paid service, offering various plans to accommodate different needs and budgets. Users can trust that their data is handled with the utmost care, as Netim is committed to maintaining high standards of security and privacy.

Tuta Mail

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Tutao GmbH

Tuta Mail is a secure email service designed with privacy at its core, offering end-to-end encryption to ensure that your communications remain confidential. Hosted on EU servers, Tuta Mail adheres to GDPR standards, providing users with peace of mind regarding data privacy and compliance. With a zero-knowledge architecture, Tuta Mail ensures that only you can access your data, not even the service providers. This email service is ideal for individuals and businesses who prioritize privacy and data protection. Tuta Mail allows anonymous registration, requiring no personal data, and supports custom domains, making it a versatile choice for businesses. The open-source email client also includes built-in spam protection features, ensuring a seamless and secure email experience. Tuta Mail's pricing model offers various plans to cater to both personal and business needs, ensuring flexibility and affordability. By choosing Tuta Mail, users benefit from the robust privacy and security measures that come with EU-hosted data, making it a reliable choice for those who value data sovereignty.

Mailfence

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Mailfence

Mailfence is a secure email service based in Europe, designed to provide users with a privacy-focused communication platform. It offers end-to-end encryption for emails, ensuring that your messages remain confidential. With built-in document collaboration tools and support for OpenPGP, Mailfence facilitates secure communication and teamwork. The service is fully compliant with GDPR, emphasizing data protection and privacy. Mailfence is ideal for individuals and businesses seeking a reliable email solution that prioritizes security and data sovereignty. Its EU-based data servers guarantee that your information is handled according to strict European privacy standards, free from ads and tracking. Additionally, Mailfence offers custom domain email hosting, an integrated calendar, and contact management features, making it a comprehensive communication tool. While specific pricing details are not provided, Mailfence typically offers tiered plans to accommodate different user needs. By choosing Mailfence, users benefit from a secure, ad-free, and privacy-respecting email service hosted within the EU.