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Posteo vs StartMail: catalog facts
Posteo	StartMail
Paid 1 euro per month, with paid upgrades for storage and aliases.	Paid Paid subscription with a 7-day free trial.
Web	Web
Signup without personal details Low fixed monthly price	Unlimited disposable aliases Encrypted mail to recipients without encryption via a password
No free tier 4 GB base storage	No free tier beyond the trial Hosted service only
Web application, Hosted service	Web application, 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 September 23, 2026

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