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Related Products
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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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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.
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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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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
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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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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.
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Duobox:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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SuperMailOS:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Duobox:
API
Offers API
Supported
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SuperMailOS:
API
Offers API
Not Supported
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Duobox:
Screenshots and VideosNo images available
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SuperMailOS:
Screenshots and VideosNo images available
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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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SuperMailOS:
Pricing
$3/month per mailbox
Free Version
Not Supported
Free Trial
Supported
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Duobox:
Reviews/
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SuperMailOS:
Reviews/
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Duobox:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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SuperMailOS:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Duobox:
Company InformationDuobox
Founded: 2026
Argentina
duobox.io/en
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SuperMailOS:
Company InformationSuperMailOS
Founded: 2026
supermailos.com
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Duobox:
AlternativesNo Alternatives
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SuperMailOS:
Alternatives |
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SuperMailOS:
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SuperMailOS:
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Duobox:
Categories |
SuperMailOS:
Categories |
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Duobox:
Integrations
ChatGPT
Supported
Claude Code
Supported
Cursor
Supported
Model Context Protocol (MCP)
Supported
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SuperMailOS:
Integrations
ChatGPT
Not Supported
Claude Code
Not Supported
Cursor
Not Supported
Model Context Protocol (MCP)
Not Supported
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Duobox:
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SuperMailOS:
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