9 open-source Email (Personal) vendors
Open-source software for Email (Personal) that you can self-host, with auditable source code — regardless of the developer's headquarters.
- vendors scored
- 9
- European
- 5
- foreign-owned
- 1
- last checked
- 11 October 2026
Vendors, scored
Score per vendor: 0 = high exposure, 100 = sovereign
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- Sovereignty score 94 out of 100DisrootNetherlands · EU sovereignDutch nonprofit collective offering privacy-focused, donation-funded email and services.
- Sovereignty score 94 out of 100mailcow (self-host)Germany · Self-hosted / open sourceSelf-hosted mailserver stack; EU-operated
- Sovereignty score 94 out of 100Roundcube (self-host)European Union (distributed) · Self-hosted / open source · owner in GermanyWebmail client; self-hostable
- Sovereignty score 94 out of 100SimpleLoginSwitzerland · Self-hosted / open sourceEmail alias service from Proton AG (Switzerland) that hides the user's real address. Open source under AGPL-3.0, offered as a hosted service and self-hostable.
- Sovereignty score 94 out of 100TutaGermany · EU sovereignGerman open-source encrypted email service
- Sovereignty score 69 out of 100MailspringUnited States · Self-hosted / open sourceOpen-source email client for Mac, Windows and Linux with local IMAP sync; published by Foundry 376, LLC.
- Sovereignty score 69 out of 100RiseupUnited States · Self-hosted / open sourceUS volunteer-run nonprofit (Riseup Labs) providing free secure email and online services for activists.
- Sovereignty score 69 out of 100ThunderbirdUnited States · Self-hosted / open sourceOpen-source email client for Windows, macOS and Linux, developed by MZLA Technologies, a subsidiary of the US-based Mozilla Foundation. Installed locally.
- Sovereignty score 49 out of 100Firefox RelayUnited States · Non-EU vendorEmail and phone masking service from Mozilla (US) that forwards messages to your real address or number, with a browser extension and dashboard.
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