What Is Proton Mail? Features, Encryption, Free Plan, and Business Options Explained

Proton Mail is a privacy-focused encrypted email service provided by Proton AG, a company based in Switzerland.

You can send and receive email much like you would with Gmail or Outlook, but Proton Mail is designed so that Proton itself cannot read the contents of your stored messages.

According to Proton, the service is used by more than 100 million accounts worldwide. A free personal plan is available, while businesses and teams can use Proton Mail for Business with features such as custom domains, centralized administration, and email groups.

This article provides an overview of Proton Mail, including how its encryption works, its main features, the differences between personal and business plans, its advantages and limitations, and the types of users it is best suited for.

What Is Proton Mail?

Proton Mail is built around a simple idea: your email should belong to you.

The service is operated by Proton AG, a company based in Geneva, Switzerland. Proton was founded by scientists who met at CERN, the European Organization for Nuclear Research, and Proton Mail launched as a web application in 2014.

How Proton Mail Encryption Works

Encryption is one of the most important things to understand about Proton Mail.

You only need to know two main concepts.

• Zero-access encryption: Messages stored on Proton’s servers are encrypted in a way that Proton cannot decrypt. Emails received from other providers are encrypted after they arrive and are stored in encrypted form.
• End-to-end encryption, or E2EE: A message is encrypted on the sender’s device and can only be decrypted by the intended recipient. This happens automatically between Proton users without requiring technical knowledge or manual configuration.

The level of protection depends on who you are sending email to.

This means you can still send sensitive information to someone who does not use Proton by using a password-protected message.

The trade-off is that you need to set and share a password with the recipient.

One important limitation is that email subject lines are not end-to-end encrypted.

This is related to the way standard email and OpenPGP work rather than being unique to Proton Mail.

For sensitive communication, it is therefore sensible to avoid placing confidential information directly in the subject line.

Main Proton Mail Features

No Advertising and Tracker Blocking

Marketing emails can contain tracking pixels that report information such as whether you opened an email or clicked a link.

Proton Mail can block remote images containing trackers and reduce the amount of information sent back to the sender.

In the web app, you can also see information about trackers that were blocked.

Phishing and Spam Protection

Proton Mail includes a phishing protection system called PhishGuard.

It can detect known phishing techniques, block or warn about suspicious messages, and show the full URL before you open certain links.

This is particularly useful on mobile devices, where hovering over a link to inspect the destination is not possible.

Hide-my-email Aliases

Proton lets you create email aliases that can be used instead of your primary email address when signing up for websites and services.

If an alias later attracts spam or is exposed in a data breach, you can disable that alias instead of changing your primary address.

Mail Plus includes up to 10 hide-my-email aliases, while Proton Unlimited includes unlimited aliases.

Inbox Organization and Productivity Features

Proton Mail includes several everyday inbox-management features:

• Automatic categorization to make important messages easier to find
• Subscription management for newsletters and mailing lists
• Scheduled sending
• Undo send
• Snooze
• Folders, labels, and filters, with some limitations on the free plan

Migrating from Gmail and Other Email Providers

Proton’s Easy Switch tool can import email, contacts, and calendars from services such as Gmail, Outlook, and Yahoo.

For Gmail, continuous forwarding or synchronization can also be configured so that new messages continue arriving in Proton Mail during the migration process.

This makes it possible to move gradually rather than switching everything at once.

Supported Devices and External Email Apps

Proton Mail provides apps for:

• Web browsers
• iOS
• Android
• Windows
• macOS
• Linux

If you prefer to use a third-party email client such as Outlook, Apple Mail, or Thunderbird, paid plans can use Proton Mail Bridge.

Proton Calendar

Proton Mail is closely integrated with Proton Calendar, which follows the same privacy-focused approach.

The calendar is available on the free plan, while paid plans add features such as calendar sharing and booking pages for scheduling meetings.

Proton Scribe

Proton Scribe is an AI writing assistant that can help draft emails, proofread text, and adjust tone.

Proton says it can also run locally on the device, helping keep email content from being used for model training.

For personal users, Scribe is available as an add-on with a free trial. For business users, availability depends on the plan or add-on configuration.

Security Foundation

Proton highlights several additional security measures:

• Its applications are open source and undergo third-party audits
• The service operates under Swiss law
• Hardware security keys such as YubiKey can be used for two-factor authentication
• Proton Sentinel provides 24/7 account monitoring for users considered to be at higher risk

Other Proton Services

Proton also offers a broader ecosystem of privacy-focused services, including:

• Proton Drive
• Proton VPN
• Proton Pass
• Proton Meet
• Proton Docs and Sheets
• Lumo, an AI assistant

Availability varies depending on the subscription plan.

Personal Proton Mail vs Proton Mail for Business

When you look at Proton Mail, you will notice that there are effectively two main entry points.

One is designed for individuals and includes a free plan.

The other is Proton Mail for Business, designed for teams and organizations.

• Personal: Proton Mail
• Business: Proton Mail for Business

The underlying email service and encryption principles are the same.

The main difference is whether the service is designed for a single user or for centrally managed teams and organizations.

Similar Plan Names Can Be Confusing

There are several plan names that can look similar.

• Personal Proton Mail and Proton Mail for Business are separate offerings. The permanent free plan is only available for personal users. Business customers start with a 14-day free trial.
• Proton Unlimited and Workspace Standard have a similar product mix. Both include services such as Mail, Calendar, Drive, VPN, and Pass, but Workspace Standard adds centralized administration, more custom-domain capacity, and per-user management.
• Mail Plus and Mail Essentials are also positioned similarly. Both include 15 GB of storage, but Mail Essentials is built for multi-user organizations and supports up to three custom domains.
• The former Business Suite was reorganized into Proton Workspace in March 2026. Older articles may still refer to Business Suite or Mail Professional, but these are not the current plan names.

Proton Mail for Business Features

The business plans extend Proton beyond email by combining encrypted email, calendars, storage, and video meetings for teams.

Here are some of the most important business features.

Use Custom Domains for Team Email

Organizations can create addresses using their own domain, such as:

you@yourcompany.com

Each user can have multiple addresses, and teams can also use features such as:

• Catch-all addresses
• Email groups that deliver messages to multiple team members

Setting up a custom domain requires DNS configuration.

Centralized User and Security Management

Administrators can manage areas such as:

• Adding and removing users
• Password changes
• Forced session sign-outs
• Permissions and storage limits
• Mandatory two-factor authentication
• Hardware security keys
• Workspace branding and company logos

Organizations can also configure users as either private or non-private.

According to Proton, non-private users are the default and can be more extensively managed by administrators.

Private users can only access their account using their own credentials.

Proton says it cannot access message contents in either configuration.

Team Calendars and Scheduling

Business users can create and share multiple calendars both inside and outside the organization.

Booking pages allow customers or partners to choose available meeting times, and confirmed meetings can include Proton Meet links.

Calendar events can also include links from services such as Zoom or Microsoft Teams.

Security and Compliance

Proton reports that it holds ISO 27001 certification and has undergone a SOC 2 Type II audit.

The company also states that its end-to-end encryption and zero-access architecture can help organizations support compliance requirements such as GDPR, HIPAA, and CCPA.

Workspace Premium includes data retention policies that can define how long email is retained or when it is automatically deleted.

Use Proton with Other Email Applications

With Proton Mail Bridge, users can work with Proton Mail through familiar desktop clients such as:

• Outlook
• Apple Mail
• Thunderbird

Business Plan Differences

All business plans include a 14-day free trial.

According to Proton’s business page, the trial can be used with up to 10 users. A 30-day money-back guarantee is also available.

Proton Mail Pros and Cons

Who Is Proton Mail Best For?

Good Fit

Proton Mail is particularly suitable for:

• People who do not want the contents of their email used for advertising or data monetization
• Freelancers and independent professionals exchanging sensitive contracts, customer information, or confidential business information
• Small teams that want custom-domain email without maintaining their own mail server
• People who want to migrate gradually from Gmail using Easy Switch and migration tools
• Organizations reviewing their email infrastructure with privacy regulations such as GDPR in mind

Consider Carefully

Proton Mail may require more consideration if:

• Your workflow depends heavily on Google Calendar, Meet, Docs, and other Google services
• You use many external automation tools or SaaS integrations tied closely to Gmail or Google Workspace
• You want a large amount of free email storage
• Complete anonymity is your highest priority; Proton Mail is a privacy-focused email service, not an anonymity service

How to Get Started with Proton Mail

For Personal Use

1. Create a free account on the official Proton Mail website.
2. Use Easy Switch to import messages, contacts, or calendars from Gmail or another provider if needed.
3. Consider upgrading later if you need features such as a custom domain or Proton Mail Bridge.

For a Company or Team

1. Choose Mail Essentials, Workspace Standard, or Workspace Premium and start the 14-day free trial.
2. Add your organization’s domain and configure the required DNS records.
3. Create user accounts for team members.
4. Use Easy Switch to migrate existing email and contacts.

Proton Mail FAQ

Is Proton Mail Free?

Yes.

Proton offers a free personal plan called Proton Free.

The core encryption approach is the same as on paid plans, but the free plan has limitations.

According to the plan details in this article, storage can be increased from 500 MB to up to 1 GB after completing the onboarding checklist. The free plan also includes one email address and a daily sending limit of up to 150 messages.

Is There a Free Business Plan?

No permanent free business plan is available.

Instead, Proton Mail for Business provides a 14-day free trial.

Is Proton Mail Safer Than Gmail?

Both services provide strong account-security features such as two-factor authentication.

The biggest difference is how message contents are handled.

Proton Mail is designed so that Proton cannot decrypt stored encrypted messages.

However, a standard message sent to an external email provider is still affected by the security and privacy model of that provider.

For that reason, using Proton Mail does not automatically make every email exchange end-to-end encrypted.

Can I Use a Custom Domain on the Free Plan?

No.

For personal users, custom domains are available from Mail Plus, which supports one custom domain, and Proton Unlimited, which supports up to three.

For business users, Mail Essentials supports up to three custom domains.

Can I Use Proton Mail with Outlook or Apple Mail?

Yes, but you need Proton Mail Bridge.

Bridge is available on paid plans and allows Proton Mail to work with desktop email applications such as Outlook, Apple Mail, and Thunderbird.

Can I Cancel and Get a Refund?

Proton provides a 30-day money-back guarantee for both personal and business plans.

Business users also have access to a 14-day free trial.

Final Thoughts: Proton Mail Is Built for People Who Prioritize Email Privacy

Proton Mail is designed so that Proton itself cannot read the encrypted contents of your stored mailbox, and its business model does not depend on advertising.

Because a free personal plan is available, it is easy to test the service before deciding whether you want to move more of your email workflow to Proton.

For individuals, the personal plans are usually the most appropriate starting point.

For organizations that need multiple users, custom domains, centralized administration, security policies, and team management, Proton Mail for Business is the more suitable option.

If your current workflow depends heavily on Gmail, Google Workspace, or third-party integrations connected to those services, review those dependencies before migrating.

For business use, the 14-day free trial is a practical way to test both the admin tools and the day-to-day email experience.