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Related Products
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Aster Mail:
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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Duobox:
About
Duobox is hosted business email for small teams that want to use addresses on their own domain. It provides personal and shared inboxes such as sales@, support@ and billing@, with shared message history and access for multiple team members. Users can connect a domain they already own or register one through Duobox, then create inboxes, aliases and forwarding rules. The service includes up to 10 inboxes of 50 GB each per person and supports additional domains. Teams can access mail in a web browser or configure a phone's mail app. Duobox also offers an MCP connection for clients such as ChatGPT, Claude and Cursor, using OAuth and configurable permissions to read mail, save drafts, send messages, or manage the team, plan and inboxes. A free tier includes one person, one inbox, one domain and 10 GB; additional people cost $2 per month each.
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Aster Mail:
Platforms Supported
Windows
Supported
Mac
Supported
Linux
Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Supported
iPad
Supported
Android
Supported
Chromebook
Supported
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Duobox:
Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Aster Mail:
Audience
Privacy-conscious users
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Duobox:
Audience
Small companies and teams that want email on their own domain, with shared inboxes like sales@ and support@, and teams that want their AI agent to work in that inbox.
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Aster Mail:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Duobox:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Aster Mail:
API
Offers API
Not Supported
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Duobox:
API
Offers API
Supported
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Aster Mail:
Screenshots and VideosNo images available
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Duobox:
Screenshots and VideosNo images available
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Aster Mail:
Pricing
No information available.
Free Version
Supported
Free Trial
Not Supported
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Duobox:
Pricing
$2/person/month
Free for one person, one inbox, one domain and 10 GB, with no card required. Paid access is $2 per added person per month in US dollars, with no contract; each person can have up to 10 inboxes of 50 GB each. The first domain is included; each additional domain costs $5 per month for hosting, and domain registration is charged separately by the registrar.
Free Version
Supported
Free Trial
Not Supported
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Aster Mail:
Reviews/
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Duobox:
Reviews/
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Aster Mail:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Duobox:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Aster Mail:
Company InformationAster Mail
Founded: 2025
United States
astermail.org
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Duobox:
Company InformationDuobox
Founded: 2026
Argentina
duobox.io/en
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Aster Mail:
Alternatives |
Duobox:
AlternativesNo Alternatives
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Aster Mail:
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Aster Mail:
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Duobox: | |||||
Aster Mail:
Categories |
Duobox:
Categories |
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Aster Mail:
Integrations
ChatGPT
Not Supported
Claude Code
Not Supported
Cursor
Not Supported
Model Context Protocol (MCP)
Not Supported
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Duobox:
Integrations
ChatGPT
Supported
Claude Code
Supported
Cursor
Supported
Model Context Protocol (MCP)
Supported
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Aster Mail:
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Duobox:
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