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About

Aster Mail is a free, open-source, end-to-end encrypted email service for people who want real privacy without the technical overhead. All encryption happens on your device before anything reaches our servers, so we have zero access to your messages or metadata. Aster uses standard OpenPGP with portable RSA-4096 keys, so you're never locked in. Your keys work with GPG, Thunderbird, or any PGP client, and they're discoverable through WKD and public keyservers. Aster-to-Aster messages use a Signal-inspired X3DH and Double Ratchet protocol for forward secrecy. Every plan includes encrypted email, custom domain support, free aliases, tracker protection, and full access across web and desktop. The entire codebase is published under AGPL v3 on GitHub, fully auditable, with a public warrant canary and documented vulnerability disclosure. Free plan includes 10 GB encrypted storage, 5 aliases, and 1 custom domain. Paid plans start at $2.99/month. Servers located in Germany.

About

Business emails often contain in-house, personal, or other sensitive content that could be intercepted and accessed without authorization if inadequately protected. Ensure all-around encrypted exchange of emails with Email Encryption from Hornetsecurity for reliable, secure email communication. Outgoing emails are automatically encrypted with one of the common encryption technologies (PGP, S/MIME, or TLS), depending on the set policy and availability of the corresponding certificates, without any further user intervention. If the sender’s public key is available, their emails are automatically decrypted and delivered to the recipient. Encryption of data has become a priority because of compliance requirements. In a business environment, the exchange of sensitive files and information takes place primarily via email communication. Encryption of the transmission path is essential to protect this data.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Privacy-conscious users

Audience

Organizations seeking a fully automated tool to secure their email encryption processes

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

No information available.
Free Version
Free Trial

Pricing

No information available.
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Aster Mail
Founded: 2025
United States
astermail.org

Company Information

Hornetsecurity
Germany
www.hornetsecurity.com/us/services/email-encryption/

Alternatives

Alternatives

ZixMail

ZixMail

Zix Corporation
Proton Mail

Proton Mail

Proton AG
Mailock

Mailock

Beyond Encryption

Categories

Categories

Integrations

Microsoft 365

Integrations

Microsoft 365
Claim Aster Mail and update features and information
Claim Aster Mail and update features and information
Claim Hornetsecurity Email Encryption and update features and information
Claim Hornetsecurity Email Encryption and update features and information