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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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Sendmux:
About
Sendmux gives AI agents their own inbox and a controlled way to send email. Each agent can receive messages, read threads, handle attachments, send replies, and react to new mail through signed webhooks or Server-Sent Events.
Teams can send through Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES. Sendmux can spread sending across providers with weighted routing, sender-domain routing, health checks, failover, and quotas by second, minute, hour, or day.
Developers get Mailbox, Sending, and Management APIs, OpenAPI docs, SDKs, the sendmux CLI, MCP tools, and Sendmux Skills. The platform also covers tenant isolation, mailbox-scoped API keys, custom domains, logs, metrics, and usage-based pricing with no per-seat or per-mailbox fees.
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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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Sendmux:
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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Sendmux:
Audience
AI agent builders that need an email API for AI agents
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Duobox:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Sendmux:
Support
Phone Support
Supported
24/7 Live Support
Supported
Online
Supported
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Duobox:
API
Offers API
Supported
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Sendmux:
API
Offers API
Supported
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Duobox:
Screenshots and VideosNo images available
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Sendmux:
Screenshots and Videos |
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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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Sendmux:
Pricing
$0.15 per 1000 emails
Free Version
Supported
Free Trial
Not Supported
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Duobox:
Reviews/
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Sendmux:
Reviews/
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Duobox:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Sendmux:
Training
Documentation
Supported
Webinars
Not Supported
Live Online
Supported
In Person
Supported
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Duobox:
Company InformationDuobox
Founded: 2026
Argentina
duobox.io/en
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Sendmux:
Company InformationSendmux
Founded: 2026
Australia
sendmux.ai
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Duobox:
AlternativesNo Alternatives
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Sendmux:
Alternatives |
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Sendmux:
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Sendmux:
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Sendmux:
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Duobox:
Categories |
Sendmux:
Categories |
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Duobox:
Integrations
Model Context Protocol (MCP)
Supported
ChatGPT
Supported
Claude
Not Supported
Claude Code
Supported
Claude Duet
Not Supported
Claude for Legal
Not Supported
Codex CLI
Not Supported
Cursor
Supported
FetchSandbox
Not Supported
Gmail
Not Supported
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Sendmux:
Integrations
Model Context Protocol (MCP)
Supported
ChatGPT
Not Supported
Claude
Supported
Claude Code
Not Supported
Claude Duet
Supported
Claude for Legal
Supported
Codex CLI
Supported
Cursor
Not Supported
FetchSandbox
Supported
Gmail
Supported
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Duobox:
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Sendmux:
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