Aster Mail Duobox

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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.
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.
Aster Mail:

Platforms Supported

Windows Supported
Mac Supported
Linux Supported
Cloud Supported
On-Premises Not Supported
iPhone Supported
iPad Supported
Android Supported
Chromebook Supported
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
Aster Mail:

Audience

Privacy-conscious users
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.
Aster Mail:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
Duobox:

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported
Aster Mail:

API

Offers API Not Supported
Duobox:

API

Offers API Supported
Aster Mail:

Screenshots and Videos

No images available
Duobox:

Screenshots and Videos

No images available
Aster Mail:

Pricing

No information available.
Free Version Supported
Free Trial Not Supported
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
Aster Mail:

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
Duobox:

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
Aster Mail:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
Duobox:

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported
Aster Mail:

Company Information

Aster Mail
Founded: 2025
United States
astermail.org
Duobox:

Company Information

Duobox
Founded: 2026
Argentina
duobox.io/en
Aster Mail:

Alternatives

IBIK ASTER

IBIK ASTER

5.0 out of 5 stars
Duobox:

Alternatives

No Alternatives
Aster Mail:
Aster Mail:
Atomic Mail

Atomic Mail

4.6 out of 5 stars
Aster Mail:
Aster Mail:
Proton Mail

Proton Mail

Proton AG
4.6 out of 5 stars
Duobox:
Aster Mail:

Categories

Email Clients Supported
Email Encryption Supported
Email Hosting Supported
Duobox:

Categories

Email Hosting Supported
Aster Mail:

Integrations

ChatGPT Not Supported
Claude Code Not Supported
Cursor Not Supported
Model Context Protocol (MCP) Not Supported
Duobox:

Integrations

ChatGPT Supported
Claude Code Supported
Cursor Supported
Model Context Protocol (MCP) Supported
Aster Mail:
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Claim Aster Mail and update features and information
Duobox:
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