Duobox Sendmux

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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.
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.
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
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
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.
Sendmux:

Audience

AI agent builders that need an email API for AI agents
Duobox:

Support

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

Support

Phone Support Supported
24/7 Live Support Supported
Online Supported
Duobox:

API

Offers API Supported
Sendmux:

API

Offers API Supported
Duobox:

Screenshots and Videos

No images available
Sendmux:

Screenshots and Videos

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
Sendmux:

Pricing

$0.15 per 1000 emails
Free Version Supported
Free Trial Not 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
Sendmux:

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
Sendmux:

Training

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

Company Information

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

Company Information

Sendmux
Founded: 2026
Australia
sendmux.ai
Duobox:

Alternatives

No Alternatives
Sendmux:

Alternatives

Sendmux:
Sendmux:
Sendmux:
EmailLabs

EmailLabs

Vercom
Duobox:
Sendmux:
emailcampaign.ai

emailcampaign.ai

Email Campaign LLC
Duobox:

Categories

Email Hosting Supported
Sendmux:

Categories

Agentic AI Supported
Email APIs Supported
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
LangChain Not Supported
Microsoft Outlook Not Supported
Python Not Supported
Ruby Not Supported
Slack Not Supported
Vercel AI SDK Not Supported
Zapier Not Supported
n8n Not Supported
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
LangChain Supported
Microsoft Outlook Supported
Python Supported
Ruby Supported
Slack Supported
Vercel AI SDK Supported
Zapier Supported
n8n Supported
Duobox:
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Claim Duobox and update features and information
Sendmux:
Claim Sendmux and update features and information
Claim Sendmux and update features and information