Duobox SuperMailOS

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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.
SuperMailOS:

About

SuperMailOS is managed business email on your own domain for small teams. You bring your domain; SuperMailOS runs the mail server and handles deliverability — SPF, DKIM, DMARC, IP reputation, and warmup — so your email lands in the inbox, not the spam folder. Setup takes minutes: verify your domain with one-click DNS on Cloudflare, DigitalOcean, and other providers (or guided copy-paste on any registrar), invite your team, and start sending. Every person gets a real mailbox; aliases like hello@ and support@ are unlimited and free. Webmail is as simple as Gmail — threads, instant search, keyboard shortcuts, labels, dark mode — plus IMAP and SMTP for any mail app, and a live deliverability dashboard showing your mail landing. Flat pricing per mailbox: Pro $3/mailbox/month annually (10 GB, 3 domains), Business $5 (30 GB, unlimited domains), custom at 50+. 14-day free trial, no credit card.
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
SuperMailOS:

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
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.
SuperMailOS:

Audience

Small and medium businesses, startups, agencies, and freelancers who want professional email on their own domain without running a mail server or managing DNS and deliverability themselves.
Duobox:

Support

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

Support

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

API

Offers API Supported
SuperMailOS:

API

Offers API Not Supported
Duobox:

Screenshots and Videos

No images available
SuperMailOS:

Screenshots and Videos

No images available
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
SuperMailOS:

Pricing

$3/month per mailbox
Free Version Not Supported
Free Trial Supported
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
SuperMailOS:

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:

Training

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

Training

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

Company Information

Duobox
Founded: 2026
Argentina
duobox.io/en
SuperMailOS:

Company Information

SuperMailOS
Founded: 2026
supermailos.com
Duobox:

Alternatives

No Alternatives
SuperMailOS:

Alternatives

SuperMailOS:
Deepbluework

Deepbluework

DeepBlueWork
5.0 out of 5 stars
SuperMailOS:
500Mail by 500apps

500Mail by 500apps

500apps
5.0 out of 5 stars
SuperMailOS:
Duobox:
SuperMailOS:
Duobox:

Categories

Email Hosting Supported
SuperMailOS:

Categories

Email Hosting Supported
Duobox:

Integrations

ChatGPT Supported
Claude Code Supported
Cursor Supported
Model Context Protocol (MCP) Supported
SuperMailOS:

Integrations

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