OpenText Core Email Message PrivacyOpenText
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Related Products
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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.
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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).
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Audience
Privacy-conscious users
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Audience
Organizations and managed-service providers searching for a tool to exchange large or sensitive files and emails
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Support
Phone Support
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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Screenshots and VideosNo images available
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Pricing
No information available.
Free Version
Free Trial
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Pricing
No information available.
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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Company InformationAster Mail
Founded: 2025
United States
astermail.org
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Company InformationOpenText
Founded: 1991
Canada
cybersecurity.opentext.com/products/email-security/email-message-privacy/
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Integrations
Microsoft Outlook
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