Aster Mail
Aster Mail: A low-cost secure email service with encryption, aliases, domains, and broad device support. Ranked #3 of 28 in Secure Email Providers by our editors (8.9/10); pricing: Free plan; best for feature-rich secure email at a low price.
At a glance
- Editor score8.9 / 10
- PricingFree plan
- Best forFeature-rich secure email at a low price
- Free planYes
- Paid from$2.42/user/mo
- End-to-end encryptionYes
- Founded2026 · Orlando, Florida, United States
- Facts checked15 Sep 2026
Where it wins
- Free plan includes 10 GB encrypted storage and five aliases
- OpenPGP, tracker blocking, import, export, and mail rules
- Web, desktop, and mobile apps plus Aster Bridge support
Where it doesn't
- Encrypted calendar is still in active development
- Server code is not public, despite open-source apps and cryptography
- Founded in 2026, so long-term maturity evidence is limited
Our verdict on Aster Mail
Aster Mail is an encrypted email service for privacy-conscious individuals, families, and teams. Its core design combines local encryption on supported devices with a zero-access encrypted mailbox architecture. Users can access mail through web, Windows, macOS, Linux, iOS, and Android apps. The service also supports custom domains, aliases, catch-all addresses, mail rules, folders, labels, categories, tracker blocking, two-factor authentication, and OpenPGP for messages sent to external recipients.
Pricing is unusually accessible for a feature-rich secure email service. The Free plan includes 10 GB of encrypted storage, five email aliases, one custom domain, end-to-end encryption, and Aster Bridge access. Star costs $2.42 per user per month with annual billing and adds 50 GB, 15 aliases, five custom domains, and unlimited mail rules. Nova costs $7.25 per user per month with annual billing and raises storage to 500 GB, while adding unlimited aliases and 30 custom domains. Supernova costs $14.50 per user per month with annual billing, includes 5 TB, unlimited aliases and domains, and dedicated support.
Aster Mail also fits users who want to move existing accounts or retain a familiar desktop workflow. Import tools support Gmail, Outlook, Yahoo, and IMAP accounts, while mailbox export uses standard MBOX format. Aster Bridge connects desktop IMAP and SMTP clients, including Thunderbird and Apple Mail. Security features include authenticator-app and hardware-key two-factor authentication, DKIM, SPF, and DMARC handling, plus OpenPGP support. The apps and cryptography library are open source, but the server code is not public. Choose Aster Mail for broad platform coverage and privacy features at a low paid entry price; consider an alternative if an available encrypted calendar or a longer operating history is important.
Your product? Our editors can test Aster Mail in depth and publish a review, labelled as paid · from $149/mo →
Aster Mail pricing
All 4 Aster Mail plans and prices →
Aster Mail fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $2.42/user/mo |
| End-to-end encryption | Yes |
| Custom domain | Yes |
| Mailbox storage | 50 GB |
| Email aliases | 15 aliases |
| Encrypted calendar | No |
| Mail protocol support | Bridge |
| Deployment | Cloud, Desktop, Mobile |
| Platforms | Web, Windows, macOS, Linux, iOS, Android |
| Integrations | 6 integrations: Gmail, Outlook, Yahoo, IMAP, Thunderbird, Apple Mail |
| Pricing | Free plan (source) |
| Website | astermail.org |
| Facts checked | 15 Sep 2026 |
Aster Mail integrations
Aster Mail lists 6 integrations on its own site.
- Gmail
- Outlook
- Yahoo
- IMAP
- Thunderbird
- Apple Mail
Alternatives to Aster Mail
- Proton MailA complete secure email suite with a capable free plan and wide platform coverage.9.4
- Tuta MailA privacy-focused email service with strong encryption and open-source apps.9.2
- MailfenceA secure email suite with OpenPGP, collaboration tools, and broad protocol support.8.6
See all Aster Mail alternatives →
Aster Mail vs the competition
- Aster Mail vs Proton Mail
- Aster Mail vs Tuta Mail
- Aster Mail vs Mailfence
- Aster Mail vs eclipso Mail Europe
- Aster Mail vs mailbox
- Aster Mail vs Runbox
Compare Aster Mail with any tool side by side →
Also Ranked In
Aster Mail is ranked in 3 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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