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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 Encryption protects sensitive information by automatically encrypting emails based on customizable DLP policies and content filters. It secures outbound communication without interrupting user workflows, ensuring compliance for regulated industries such as healthcare, finance, and government. The platform evaluates email subjects, bodies, and attachments in real time to determine whether to encrypt, quarantine, or block messages. Its Best Method of Delivery engine selects the most secure transmission option—S/MIME, TLS, or a secure messaging portal—to guarantee protected delivery to any recipient. Users can communicate securely across devices, while administrators gain full visibility through graphical reporting and compliance dashboards. By reducing human error and automating enforcement, the solution strengthens security posture and supports safe collaboration inside and outside the organization.

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

OpenText Core Email Encryption is ideal for organizations in regulated or data-sensitive industries that need automated, reliable protection for confidential email communication

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-encryption/

Alternatives

Alternatives

Mailock

Mailock

Beyond Encryption
Proton Mail

Proton Mail

Proton AG
RMail

RMail

RPost

Categories

Categories

Integrations

HostBill
OpenText Core Email Threat Protection

Integrations

HostBill
OpenText Core Email Threat Protection
Claim Aster Mail and update features and information
Claim Aster Mail and update features and information
Claim OpenText Core Email Encryption and update features and information
Claim OpenText Core Email Encryption and update features and information