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mailbox.org vs Posteo: catalog facts
mailbox.org	Posteo
Paid Subscription email and workspace service that can be tried before committing.	Paid 1 euro per month, with paid upgrades for storage and aliases.
Web	Web
Email, storage, meetings and office tools in one account Data hosted in Germany under GDPR	Signup without personal details Low fixed monthly price
A hosted service, not software you run yourself Requires a paid subscription after the trial	No free tier 4 GB base storage
Hosted service	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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