Mailbox.org vs Proton Mail Comparison

Feature	Mailbox.org Visit →	Proton Mail Visit →
Overview
Rating	6.8	8.5
Pricing	$1.00/moLight (individual, annual) $3.00/moStandard (individual, annual) $9.00/moPremium (individual, annual) Show billing detailsHide billing details Light (individual, annual): EUR 12/year billed annually Standard (individual, annual): EUR 36/year billed annually (EUR 4/month if billed monthly) Premium (individual, annual): EUR 108/year billed annually (EUR 12/month if billed monthly)	$4.99/moMail Plus (individual, annual) $12.99/moProton Unlimited (individual, annual) Show billing detailsHide billing details Mail Plus (individual, annual): $59.88/year at renewal ($47.88 first year with the introductory rate) Proton Unlimited (individual, annual): $155.88/year at renewal ($119.88 first year with the introductory rate)
Free tier	Paid only	Limited free tier Show detailsHide details 1 GB storage, 1 email address, 150 messages/day, 10 hide-my-email aliases, no custom domain
Established	2014	2014
Platforms	Not specified	WindowsmacOSLinuxAndroidiOS
Privacy
Jurisdiction	Germany Show detailsHide details Heinlein Hosting GmbH, Schwedter Strasse 8/9A, 10119 Berlin. Registered at the District Court of Berlin-Charlottenburg, HRB 220010 B. Managing director Peer Heinlein, also CEO of the parent Heinlein Group, founded 1989.	Switzerland Show detailsHide details Proton AG, Route de la Galaise 32, 1228 Plan-les-Ouates, Geneva. Since June 2024 the primary shareholder is the non-profit Proton Foundation, also based in Geneva. Proton Europe sàrl (Luxembourg) is the designated EU GDPR representative.
Independent security audit	None on record	Securitum 2021 Show audit detailsHide audit details Source-code security audit of the redesigned Proton Mail web client and Proton Calendar, prior to release
Source code	Partly open source	Fully open source
Zero-access encryption	No	Yes
Intra-provider E2EE	No	Yes
External PGP	Native	Manual import
Past data breach	No	No
Telemetry	On unless you opt out	On unless you opt out
Features
Hosting	Cloud	Cloud
Custom domain support	Yes	Yes
Aliases	Limited	Unlimited
Anti-spam approach	Multi-stage malware and spam scanning at mail transport time, before any optional PGP encryption is applied, combined with SPF, DKIM, DMARC, DNSSEC, DANE and MTA-STS at the protocol level; no content-scanning of already-encrypted mailbox data is described.	PhishGuard flags spoofing and phishing using sender authentication (SPF/DKIM/DMARC) and metadata such as headers, link URLs and attachment hashes, not message content, since encryption prevents Proton from reading it; a machine-learning model retrains on user feedback (marking spam/phishing or rescuing a message from spam).
Bundled services	CalendarDriveOfficeMeet	CalendarDriveVPNPass