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Proton Mail Business

Swiss-hosted zero-access encrypted email with the strongest privacy protections

ToolEmail SecurityCloud, Open source

Pricing: Free and open source; paid tiers on the vendor site.

Reviewed by the Cyber Vendor Guide editorial team against the public sources cited below · Last reviewed February 2026 · How we review listings

What is Proton Mail Business?

Proton Mail Business provides zero-access end-to-end encrypted email hosted in Switzerland under some of the world's strongest privacy laws. Messages are encrypted on-device before reaching Proton's servers, meaning even Proton cannot read your email. For HIPAA-covered entities, Proton signs BAAs on its Business and Enterprise plans. The platform includes a full suite of privacy tools including Proton Calendar, Drive, and VPN.

Best for: Privacy-conscious organizations needing zero-access encryption under Swiss law with optional HIPAA compliance

Pros

  • Strongest privacy protections. Zero-access encryption
  • Swiss jurisdiction beyond US and EU reach
  • Open source and independently audited
  • Affordable per-user pricing
  • Complete privacy suite (mail, calendar, drive, VPN)

Things to check

  • Non-Proton recipients see messages via secure portal
  • Fewer enterprise admin features than competitors
  • Migration from existing email providers can be complex
  • Limited third-party integrations

Reported in public reviews and vendor documentation. See sources below.

Key Features

Zero-access end-to-end encryption
Swiss jurisdiction and data residency
HIPAA-compliant with signed BAA (Business+)
Open-source and independently audited
Self-destructing messages
Encrypted contacts and calendar
Custom domain support
Bridge app for Outlook, Thunderbird, Apple Mail

Do you work at Proton Mail Business? to confirm the details or send us a correction.

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Sources & references

Where the information on this listing comes from. Always verify pricing and capabilities against the vendor before a purchasing decision.

Spot an error, or do you represent Proton Mail Business? Request a correction.

Key facts

Pricing
Free and open source; paid tiers on the vendor site.
Model
Per-user
Founded
2014
Cloud
Yes
Self-hosted
No
Open source
Yes
Visit websiteView on GitHub

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Where Proton Mail Business appears

Guides

Shortlists

Certifications

HIPAA, GDPR, ISO 27001