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Posteo vs Mailo: catalog facts
Posteo	Mailo
Paid 1 euro per month, with paid upgrades for storage and aliases.	Freemium Free sign-up, with a paid Pro offer for businesses and organisations.
Web	Android, Web
Signup without personal details Low fixed monthly price	Data stored on servers in France and not used or sold Choice of address domain
No free tier 4 GB base storage	Mainly aimed at French-speaking users No end-to-end encryption mentioned
Web application, Hosted service	Downloadable app, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.