Best ONS Mail Alternatives in 2026
The top ONS Mail alternatives are Tuta Mail, Proton Mail and Mailfence: 15 encrypted email services our editors would look at instead of ONS Mail, in our ranking order.
ONS Mail: A free encrypted mail service that adds secure messaging, custom domains, and productivity tools. Where it falls short: the free-only model may not fit teams seeking paid service tiers.
Switching from ONS Mail? For most encrypted email services buyers the best ONS Mail alternative is Tuta Mail, built for privacy-focused users wanting encrypted calendar. On a budget, Aster Mail starts at $2.42/mo. Riseup Email offers the most mailbox storage (1 GB).
Why People Look for an ONS Mail Alternative
- 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
Quick Picks by What You Need
- Best overallTuta Mail9.3
Privacy-focused users wanting encrypted calendar
Visit Tuta Mail - Lowest priceAster Mail7.4
Paid plans from $2.42/mo
Visit Aster Mail - Best free optionTuta Mail9.3
Has a free plan
Visit Tuta Mail - Most mailbox storageRiseup Email8.0
1 GB
Visit Riseup Email
All 15 ONS Mail Alternatives, Ranked
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.
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Best forPrivacy-focused users wanting encrypted calendar
- Better than ONS Mail:
- Editor score 9.3 vs 6.0
A privacy-focused email suite with encrypted calendar tools and a permanent free plan.
- End-to-end encryption
9.3/10★★★★★Visit Tuta Mail -
Best forMature all-platform encrypted email
- Better than ONS Mail:
- Editor score 9.2 vs 6.0
A mature encrypted email service with broad platform support and a capable free plan.
- End-to-end encryption
9.2/10★★★★★Visit Proton Mail -
Best forEstablished OpenPGP groupware
- Better than ONS Mail:
- Editor score 8.9 vs 6.0
A mature OpenPGP email suite with groupware, mobile access, and broad protocol support.
- End-to-end encryption
8.9/10★★★★☆Visit Mailfence -
Best forLow-cost encrypted mail with standard protocols
- Better than ONS Mail:
- Editor score 8.7 vs 6.0
Low-cost encrypted email with standard protocols and broad client support.
- End-to-end encryption
8.7/10★★★★☆Visit mailbox -
Best forAnonymous OpenPGP mailbox users
- Better than ONS Mail:
- Editor score 8.3 vs 6.0
A privacy-focused mailbox with OpenPGP, aliases, and calendar tools.
- End-to-end encryption
8.3/10★★★★☆Visit Posteo -
Best forFree privacy-oriented mailbox access
- Better than ONS Mail:
- Editor score 8.0 vs 6.0
A free, privacy-oriented mailbox with strong client support and no default end-to-end encryption.
- Zero-access storage
- Custom domains
8.0/10★★★★☆Visit Riseup Email -
Best forSecure forms and signatures with email
- Better than ONS Mail:
- Editor score 7.9 vs 6.0
A paid encrypted email service with forms, signatures, scheduling, and 15 GB personal storage.
7.9/10★★★★☆Visit Hushmail -
Best forEncrypted-mail-adjacent groupware
- Better than ONS Mail:
- Editor score 7.8 vs 6.0
A Swiss-hosted groupware suite with PGP email encryption, but not true end-to-end encryption.
- End-to-end encryption
7.8/10★★★★☆Visit Kolab Now -
Best forAlias-heavy private email users
- Better than ONS Mail:
- Editor score 7.7 vs 6.0
A privacy-focused email service with strong alias support and flexible encryption.
- End-to-end encryption
7.7/10★★★★☆Visit StartMail -
Best forBusinesses needing auditable secure email delivery
- Better than ONS Mail:
- Editor score 7.6 vs 6.0
A business email security layer for encryption, delivery proof, tracking, and compliance.
- End-to-end encryption
7.6/10★★★★☆Visit RMail -
Best forLow-cost OpenPGP with classic protocols
- Better than ONS Mail:
- Editor score 7.5 vs 6.0
A low-cost encrypted email service with classic protocols and useful personal cloud tools.
- End-to-end encryption
7.5/10★★★★☆Visit eclipso Mail -
Best forFeature-rich encryption at a low price
- Better than ONS Mail:
- Editor score 7.4 vs 6.0
Aster Mail combines broad privacy controls, custom domains, and low-cost paid plans.
- End-to-end encryption
7.4/10★★★★☆Visit Aster Mail -
Best forProtocol-friendly encrypted mailbox hosting
- Better than ONS Mail:
- Editor score 7.3 vs 6.0
A protocol-friendly encrypted mailbox with flexible domains and generous alias support.
7.3/10★★★★☆Visit Runbox -
Best forLarge mailbox with encrypted connections
- Better than ONS Mail:
- Editor score 7.2 vs 6.0
A spacious private mailbox with aliases, domain support, and standard email protocols.
7.2/10★★★★☆Visit Soverin -
Best forFree basic mail with user-managed encryption
- Better than ONS Mail:
- Editor score 6.8 vs 6.0
A free webmail account with standard mail protocols, but user-managed encryption is required.
6.8/10★★★☆☆Visit Cock.li
ONS Mail Alternatives: Common Questions
What is the best alternative to ONS Mail?
Tuta Mail: #1 in our Encrypted Email Services ranking, with an editor score of 9.3 out of 10. A privacy-focused email suite with encrypted calendar tools and a permanent free plan.
Is there a free alternative to ONS Mail?
Yes. Tuta Mail, Proton Mail, Mailfence, Riseup Email and RMail have a free plan or a free tier (8 of the 15 alternatives on this page).
What is the cheapest paid alternative to ONS Mail?
Of the alternatives here that publish a price, Aster Mail starts lowest, at $2.42/mo.
Why do people look for ONS Mail alternatives?
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.
Which ONS Mail alternative has the most mailbox storage?
Riseup Email, with 1 GB.
How do I switch from ONS Mail?
Export your data from ONS Mail (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel ONS Mail.
How to Switch from ONS Mail
- Export your data from ONS Mail (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel ONS Mail.
ONS Mail vs Each Alternative
| # | Tool | Free plan | Paid from | End-to-end encryption | Score |
|---|---|---|---|---|---|
| 23 | ONS Mail | Yes | Free | Yes | 6.0 |
| 1 | Tuta Mail | Yes | €3/user/mo | Yes | 9.3 |
| 2 | Proton Mail | Yes | $3.99/user/mo | Yes | 9.2 |
| 3 | Mailfence | Yes | €2.50/mo | Yes | 8.9 |
| 4 | mailbox | No | €1/user/mo | Yes | 8.7 |
| 5 | Posteo | No | €1/user/mo | Yes | 8.3 |
| 6 | Riseup Email | Yes | Free | No | 8.0 |
| 7 | Hushmail | $59.99/user/yr | No | 7.9 | |
| 8 | Kolab Now | No | 5 CHF/user/mo | Yes | 7.8 |
| 9 | StartMail | No | $59.88/user/yr | Yes | 7.7 |
| 10 | RMail | Yes | Yes | 7.6 | |
| 11 | eclipso Mail Europe | Yes | €1.49/mo | Yes | 7.5 |
| 12 | Aster Mail | Yes | $2.42/mo | Yes | 7.4 |
| 13 | Runbox | No | €1.66/user/mo | No | 7.3 |
| 14 | Soverin | No | €3.25/user/mo | 7.2 | |
| 15 | Cock.li | Yes | Free | No | 6.8 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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