ONS Mail
ONS Mail: A free encrypted mail service that adds secure messaging, custom domains, and productivity tools. Ranked #23 of 41 in Encrypted Email Services by our editors (6.0/10); pricing: Free plan; best for free encrypted mail with built-in basics.
At a glance
- Editor score6.0 / 10
- PricingFree plan
- Best forFree encrypted mail with built-in basics
- Free planYes
- Paid fromFree
- Zero-access storageYes
- Facts checked20 Sep 2026
Where it wins
- Free end-to-end encrypted email with custom-domain support
- Password-protected and self-destructing messages with expiry controls
- Includes calendar, contacts, notes, tasks, and mobile apps
Where it doesn't
- The free-only model may not fit teams seeking paid service tiers
- Built-in productivity tools may exceed the needs of email-only users
- No integrations are provided for connected third-party workflows
Our verdict on ONS Mail
ONS Mail is a privacy-focused email and communication service for individuals, professionals, and businesses. Its free account combines end-to-end encrypted email with password-protected secure messages, self-destructing messages, custom-domain email, calendar management, contacts, notes, and task management. Access spans web, Windows, Linux, iOS, and Android, giving users a broad set of entry points without separating email from basic productivity work. It is best suited to people who want encrypted mail and practical built-in tools without a paid plan requirement.
Security is the product’s clearest focus. ONS Mail states that it does not read users’ emails and operates a zero-knowledge architecture, while its category specifications include zero-access storage. Two-factor authentication, session management, and account activity controls add account-level protections. Secure messages can be password-protected and configured to self-destruct after an expiry period, which gives users more control over sensitive communications than ordinary email alone. Open-source status may also matter to buyers who prefer a product with publicly inspectable software.
The broader workspace approach is useful for users who want email, scheduling, contacts, notes, and tasks in one service. Custom-domain support extends the offering to business email, while mobile apps support access beyond the browser. The tradeoff is focus: people seeking only a lightweight mailbox may not need the additional tools, and organizations that depend on connected third-party workflows should look for a service built around integrations. Choose ONS Mail for free encrypted communication with built-in essentials; consider an alternative when paid-tier depth or broader ecosystem connectivity is central to the buying decision.
Your product? Our editors can test ONS Mail in depth and publish a review, labelled as paid · from $149/mo →
ONS Mail pricing
ONS Mail fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| End-to-end encryption | Yes |
| Zero-access storage | Yes |
| Custom domains | Yes |
| Email alias limit | Not verified |
| Mailbox storage | Not verified |
| Mobile apps | Yes |
| Private calendar | Yes |
| Deployment | Cloud, Mobile |
| Platforms | Web, Windows, Linux, iOS, Android |
| Compliance & security | GDPR, 2FA |
| Support | Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | onsmail.com |
| Facts checked | 20 Sep 2026 |
Alternatives to ONS Mail
- Tuta MailA privacy-focused email suite with encrypted calendar tools and a permanent free plan.9.3
- Proton MailA mature encrypted email service with broad platform support and a capable free plan.9.2
- MailfenceA mature OpenPGP email suite with groupware, mobile access, and broad protocol support.8.9
See all ONS Mail alternatives →
Used ONS Mail? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used ONS Mail for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
ONS Mail is listed in our Encrypted Email Services directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/ons-mail/"><img src="https://www.itechguides.com/best/badge/ons-mail.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update