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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

OpenText Core Email Message Privacy enables organizations to securely send emails and attachments, up to 100 GB per message, through a browser or Outlook without relying on insecure cloud-sharing tools. It uses AES-256 encryption at rest, and messages are uploaded to a secure portal; as the sender, you can set and manage permissions such as view, reply, and forward, even revoking rights after delivery. Recipients receive a secure link and can access messages via web or mobile without installing extra software. It includes built-in e-signature support, allowing recipients to add legally binding signatures directly within the secure message flow. Every interaction, delivery, opening, download, and signature is tracked in real time and logged for full auditability. It supports large file transfers while avoiding infrastructure complexity; it’s SaaS-based, requires no extra servers, and integrates with single sign-on (SSO).

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 and managed-service providers searching for a tool to exchange large or sensitive files and emails

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

OpenText
Founded: 1991
Canada
cybersecurity.opentext.com/products/email-security/email-message-privacy/

Alternatives

Alternatives

RMail

RMail

RPost
Delivery Trust

Delivery Trust

Identillect Technologies
Proton Mail

Proton Mail

Proton AG
Mailock

Mailock

Beyond Encryption

Categories

Categories

Integrations

Microsoft Outlook

Integrations

Microsoft Outlook
Claim Aster Mail and update features and information
Claim Aster Mail and update features and information
Claim OpenText Core Email Message Privacy​ and update features and information
Claim OpenText Core Email Message Privacy​ and update features and information