Audience
Privacy-conscious users
About Aster Mail
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.
Other Popular Alternatives & Related Software
Atomic Mail
Atomic Mail is a secure and user-centric email hosting provider, dedicated to offering privacy-first email services. With features such as alias creation, robust security measures, and seamless account recovery, AtomicMail ensures your email experience is both private and hassle-free.
Creation of Aliases (Hide-my-email): Maintain your privacy by creating multiple email aliases;
Spam Free, No Ads;
Email Password Protection;
End-to-End Encryption: only you and your intended recipient can read the message;
Zero Access Encryption: Atomic Mail cannot access your emails;
Account Recovery with Seed Phrase: Recover access to your account with a unique seed phrase. Can regain control of your email account without compromising security.
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IBIK ASTER
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Letterbox
Who reads your mails? With regular mails you, the receiver, all mail providers and maybe others can read them. With end-to-end encrypted mails only the sender and the receivers can read them. Our iOS-App Letterbox makes end-to-end encryption easy to use, is compatible with most mail providers and supports the standard encryption protocol OpenPGP.
Letterbox is similar to common mail apps but indicates the security state of incoming and outgoing mails. We disinguish between a confidential and insecure mails.
Letterbox is a free open-source mail client on iOS and part of an ongoing research project at the Freie Universität Berlin, Germany. Letterbox is still under development but you can soon use the app on your device with Apple's TestFlight app.
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MsgSafe.io
Instantly create as many email addresses as you need - each associated with their own group of contacts. Share addresses with anyone, but keep your real email address private. Stop telecom companies, governments, and hackers from seeing with whom you communicate. Each virtual mailbox is automatically set up with 4096-bit GPG and S/MIME encryption keys and certificates. All email stored at MsgSafe-io is encrypted. You can manage the encryption profile for each contact you communicate with. Protect your entire family or organization by managing all identities and email addresses with the domain you already own. If you don’t own a domain, you can use our domain registration services to purchase a domain integrated with MsgSafe-io and privacy protection. You don’t trust FaceTime, Skype, Duo, Hangouts and similar services hosted by companies like Apple, Microsoft and Google? Try our secure and private audio and video services. You can invite people to call you from a browser link.
Learn more about MsgSafe.io
Pricing
Free Version:
Free Version available.
Integrations
No integrations listed.
Company Information
Aster Mail
Founded: 2025
United States
astermail.org
Videos and Screen Captures
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Product Details
Platforms Supported
Cloud
Windows
Mac
Linux
iPhone
iPad
Android
Chromebook
Training
Documentation
Videos
Support
Online
Aster Mail Frequently Asked Questions
Q: What kinds of users and organization types does Aster Mail work with?
Aster Mail works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does Aster Mail support in their product?
Aster Mail supports these languages: English.
Q: What kind of support options does Aster Mail offer?
Aster Mail offers support via online.
Q: Does Aster Mail have a mobile app?
Yes, Aster Mail has a mobile app for Android, iPad, and iPhone.
Q: What type of training does Aster Mail provide?
Aster Mail provides training in the form of documentation and videos.
