Posteo vs StartMail Comparison

Feature	Posteo Visit →	StartMail Visit →
Overview
Rating	6.1	6.4
Pricing	$1.00/moStandard (individual, monthly) Show billing detailsHide billing details Standard (individual, monthly): EUR 1/month, prepaid credit, no annual commitment	$4.99/moPersonal (annual) $6.99/moBusiness (annual) Show billing detailsHide billing details Personal (annual): $59.88/year Business (annual): $83.88/year
Free tier	Paid only	Paid only
Established	2009	2013
Platforms	Not specified	Not specified
Privacy
Jurisdiction	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.	Netherlands Show detailsHide details StartMail B.V., registered in Zeist, Netherlands. Servers are company-owned hardware in locked cabinets inside Dutch data centers — not third-party cloud infrastructure.
Independent security audit	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)	None on record
Source code	Partly open source	Closed source
Zero-access encryption	Yes	No
Intra-provider E2EE	No	No
External PGP	Native	Native
Past data breach	No	No
Telemetry	No telemetry	On unless you opt out
Features
Hosting	Cloud	Cloud
Custom domain support	No	Yes
Aliases	Limited	Unlimited
Anti-spam approach	Described by Posteo only as a 'highly efficient spam and virus filter' — no further technical methodology is publicly documented.	Personal, per-user Bayesian spam filter (SpamAssassin) trained by the user marking mail as spam or not; the training data is stored inside that user's own encrypted vault rather than pooled across the service.
Bundled services	CalendarAddress BookNotes	Not specified