Mailbox.org vs Posteo Comparison

Feature	Mailbox.org Visit →	Posteo Visit →
Overview
Rating	6.8	6.1
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)	$1.00/moStandard (individual, monthly) Show billing detailsHide billing details Standard (individual, monthly): EUR 1/month, prepaid credit, no annual commitment
Free tier	Paid only	Paid only
Established	2014	2009
Platforms	Not specified	Not specified
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.	Germany Show detailsHide details Posteo e.K. (a registered sole proprietorship), Methfesselstr. 38, 10965 Berlin. Registered at the Handelsregister Berlin-Charlottenburg, HRA 47592 B. Founded and owned by Patrik and Sabrina Löhr, self-financed with no external investors or debt.
Independent security audit	None on record	Cure53 2017 Show audit detailsHide audit details Posteo web application, including Calendar and Notes (a separate, earlier Cure53 test in April 2015 covered Crypto Mail Storage specifically)
Source code	Partly open source	Partly open source
Zero-access encryption	No	Yes
Intra-provider E2EE	No	No
External PGP	Native	Native
Past data breach	No	No
Telemetry	On unless you opt out	No telemetry
Features
Hosting	Cloud	Cloud
Custom domain support	Yes	No
Aliases	Limited	Limited
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.	Described by Posteo only as a 'highly efficient spam and virus filter' — no further technical methodology is publicly documented.
Bundled services	CalendarDriveOfficeMeet	CalendarAddress BookNotes