Tuta Mail Business

Tuta Mail Business is the business tier of Tuta (formerly Tutanota), an end-to-end encrypted email and calendar service run by Tutao GmbH in Hanover, Germany. It encrypts message bodies, subject lines, attachments, contacts and calendars, including post-quantum cryptography, with data stored on Tuta-owned servers in ISO 27001 certified German data centres under GDPR. Business plans add custom domains, unlimited aliases, multiple users, shared calendars and per-user storage up to 1 TB. Pricing starts around €3/month for custom domains and €6/month per user on the business tier; a free personal tier exists.