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