Email providers

mailbox.orgvsProton

Both score similarly on sovereignty (84 vs 82). The right choice depends on the details below – open source, self-hosting, pricing and focus.

Score comparison

	mailbox.org	Proton
Sovereignty	84	82
Privacy	85	95
Open Source	45	70
Business fit	76	74
Migration ease	65	60
Pricing transparency	80	82
Enterprise readiness	70	72

Features & facts

	mailbox.org	Proton
Country	Germany	Switzerland
Open Source	No	Yes
Self-Hosting	No	No
Cloud/SaaS	Yes	Yes
EU data residency	Yes	No
DPA / AV-Vertrag	Yes	Yes
ISO 27001	Yes	Yes
Data location	Germany (Berlin, two redundant data centers)	Switzerland (primary location); own server hardware also in Germany
From	1 € / Monat	3,99 € / Monat
Founded	2014	2014

mailbox.org

Germany

German business email and groupware with servers in Berlin – based on Open-Xchange, ISO 27001 and BSI C5.

Strengths

Standard protocols (IMAP/SMTP/CalDAV), PGP & S/MIME, groupware
Servers exclusively in Germany, ISO 27001 + BSI C5
Affordable from €1/month, ad-free

Weaknesses

No continuous end-to-end encryption like Tuta/Proton
Interface feels less modern

Proton

Switzerland

Swiss privacy suite with end-to-end encrypted email, calendar, drive, password manager and VPN.

Strengths

End-to-end encryption across the whole suite
Own server hardware (Switzerland/Germany), no hyperscaler
Open source, ISO 27001 and SOC 2 Type II

Weaknesses

Headquartered in Switzerland (EFTA), not in the EU/EEA
No self-hosting
Encryption limits some convenience features

Choose mailbox.org if…

Freelancers and SMEs that want groupware instead of pure encryption
Public authorities and schools with sovereignty requirements

Choose Proton if…

Privacy-conscious private users and teams
Users who want an encrypted all-in-one suite

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Scores are editorial orientation, not legal advice. Details are based on public provider information and are not independently verified.