Best Thundermail Alternatives in 2026
The top Thundermail alternatives are Tuta Mail, Proton Mail and Mailfence: 15 encrypted email services our editors would look at instead of Thundermail, in our ranking order.
Thundermail: A capable hosted-mail bundle, but email encryption is not presented as a core feature. Where it falls short: email encryption is not presented as a core feature.
Switching from Thundermail? For most encrypted email services buyers the best Thundermail alternative is Tuta Mail, built for privacy-focused users wanting encrypted calendar. On a budget, Aster Mail starts at $2.42/mo, against $6/mo for Thundermail. Riseup Email offers the most mailbox storage (1 GB).
Why People Look for a Thundermail Alternative
- Email encryption is not presented as a core feature
- Currently in beta with waitlist and invitation-based availability
- Only one paid plan is listed
- No free plan — 8 of the alternatives below have it
- No zero-access storage — 1 of the alternatives below has it
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 (Thundermail has none)
Visit Tuta Mail - Most mailbox storageRiseup Email8.0
1 GB
Visit Riseup Email - Best for zero-access storageRiseup Email8.0
Zero-access storage (Thundermail: no)
Visit Riseup Email
All 15 Thundermail 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.
-
Best forPrivacy-focused users wanting encrypted calendar
- Better than Thundermail:
- Free plan
- Editor score 9.3 vs 4.0
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 Thundermail:
- Free plan
- Paid from: $3.99/user/mo vs $6/user/mo
- Editor score 9.2 vs 4.0
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 Thundermail:
- Free plan
- Editor score 8.9 vs 4.0
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 Thundermail:
- Editor score 8.7 vs 4.0
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 Thundermail:
- Editor score 8.3 vs 4.0
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 Thundermail:
- Free plan
- Zero-access storage
- Editor score 8.0 vs 4.0
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 Thundermail:
- Editor score 7.9 vs 4.0
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 Thundermail:
- Editor score 7.8 vs 4.0
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 Thundermail:
- Editor score 7.7 vs 4.0
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 Thundermail:
- Free plan
- Editor score 7.6 vs 4.0
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 Thundermail:
- Free plan
- Editor score 7.5 vs 4.0
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 Thundermail:
- Free plan
- Paid from: $2.42/user/mo vs $6/user/mo
- Editor score 7.4 vs 4.0
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 Thundermail:
- Editor score 7.3 vs 4.0
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 Thundermail:
- Editor score 7.2 vs 4.0
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 Thundermail:
- Free plan
- Editor score 6.8 vs 4.0
A free webmail account with standard mail protocols, but user-managed encryption is required.
6.8/10★★★☆☆Visit Cock.li
Thundermail Alternatives: Common Questions
What is the best alternative to Thundermail?
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 Thundermail?
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 Thundermail?
Of the alternatives here that publish a price, Aster Mail starts lowest, at $2.42/mo.
Why do people look for Thundermail alternatives?
Email encryption is not presented as a core feature; Currently in beta with waitlist and invitation-based availability; Only one paid plan is listed.
Which Thundermail alternative has the most mailbox storage?
Riseup Email, with 1 GB.
How do I switch from Thundermail?
Export your data from Thundermail (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 Thundermail.
How to Switch from Thundermail
- Export your data from Thundermail (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 Thundermail.
Thundermail vs Each Alternative
| # | Tool | Free plan | Paid from | End-to-end encryption | Score |
|---|---|---|---|---|---|
| 40 | Thundermail | No | $6/mo | 4.0 | |
| 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
Last updated · How we research and update