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Email inbox API for AI agents with MCP tools for Mailbox, Management, and Sending APIs.
About
Email inbox API for AI agents with MCP tools for Mailbox, Management, and Sending APIs.
Remote endpoints: streamable-http: https://mcp.sendmux.ai/mcp
Security Report
10.0
Low Risk10.0Low RiskValid MCP server (1 strong, 1 medium validity signals). No known CVEs in dependencies. Package registry verified. Imported from the Official MCP Registry.
Endpoint verified · Requires authentication · 2 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Tool surfaces to run locally.
Environment variable: SENDMUX_MCP_SURFACES
Mailbox API key for Mailbox API and Sending API tools.Required
Environment variable: SENDMUX_MAILBOX_API_KEY
Root API key for Management API tools.Required
Environment variable: SENDMUX_MANAGEMENT_API_KEY
Optional Sending API key when it differs from the Mailbox API key.Required
Environment variable: SENDMUX_SENDING_API_KEY
How to Install & Connect
Available as Local & Remote
This plugin can run on your machine or connect to a hosted endpoint. during install.
Documentation
View on GitHubFrom the project's GitHub README.
Sendmux SDKs
Official SDK, CLI, and MCP workspace for Sendmux.
- Product documentation: sendmux.ai/docs
- Management API reference: sendmux.ai/docs/api/introduction
- Mailbox API reference: sendmux.ai/docs/mailbox-api/introduction
- Sending API reference: sendmux.ai/docs/sending-api/introduction
- MCP guide: sendmux.ai/docs/guides/mcp
Packages
| Ecosystem | Package | Surface | API key or auth | Install | Source |
|---|---|---|---|---|---|
| npm | @sendmux/core | Shared TypeScript helpers | n/a | npm install @sendmux/core | packages/ts/core |
| npm | @sendmux/sending | Sending API | smx_mbx_* | npm install @sendmux/sending | packages/ts/sending |
| npm | @sendmux/mailbox | Mailbox API | smx_mbx_* | npm install @sendmux/mailbox | packages/ts/mailbox |
| npm | @sendmux/management | Management API | smx_root_* | npm install @sendmux/management | packages/ts/management |
| npm | @sendmux/sdk | TypeScript umbrella package | surface-specific | npm install @sendmux/sdk | packages/ts/sdk |
| npm | @sendmux/cli | sendmux CLI | command/profile-specific | npm install -g @sendmux/cli | packages/ts/cli |
| Homebrew | sendmux | sendmux CLI | command/profile-specific | brew install sendmux/tap/sendmux | Sendmux/homebrew-tap |
| PyPI | sendmux-core | Shared Python helpers | n/a | pip install sendmux-core | packages/python/core |
| PyPI | sendmux-sending | Sending API | smx_mbx_* | pip install sendmux-sending | packages/python/sending |
| PyPI | sendmux-mailbox | Mailbox API | smx_mbx_* | pip install sendmux-mailbox | packages/python/mailbox |
| PyPI | sendmux-management | Management API | smx_root_* | pip install sendmux-management | packages/python/management |
| PyPI | sendmux-sdk | Python umbrella package | surface-specific | pip install sendmux-sdk | packages/python/sdk |
| PyPI | sendmux-mcp | Local, self-hosted, and hosted MCP servers | OAuth for hosted; surface-specific keys for local | pip install sendmux-mcp | packages/python/mcp |
| Go | sendmux.ai/go/core | Shared Go helpers | n/a | go get sendmux.ai/go@v1.0.0 | go/core |
| Go | sendmux.ai/go/sending | Sending API | smx_mbx_* | go get sendmux.ai/go@v1.0.0 | go/sending |
| Go | sendmux.ai/go/mailbox | Mailbox API | smx_mbx_* | go get sendmux.ai/go@v1.0.0 | go/mailbox |
| Go | sendmux.ai/go/management | Management API | smx_root_* | go get sendmux.ai/go@v1.0.0 | go/management |
| Go | sendmux.ai/go/sdk | Go umbrella package | surface-specific | go get sendmux.ai/go@v1.0.0 | go/sdk |
| crates.io | sendmux | Rust umbrella crate | surface-specific | cargo add sendmux | rust |
| Packagist | sendmux/core | Shared PHP helpers | n/a | composer require sendmux/core:^1.0 | packages/php/core |
| Packagist | sendmux/sending | Sending API | smx_mbx_* | composer require sendmux/sending:^1.0 | packages/php/sending |
| Packagist | sendmux/mailbox | Mailbox API | smx_mbx_* | composer require sendmux/mailbox:^1.0 | packages/php/mailbox |
| Packagist | sendmux/management | Management API | smx_root_* | composer require sendmux/management:^1.0 | packages/php/management |
| Packagist | sendmux/sdk | PHP umbrella package | surface-specific | composer require sendmux/sdk:^1.0 | packages/php/sdk |
| RubyGems | sendmux-core | Shared Ruby helpers | n/a | gem install sendmux-core | packages/ruby/core |
| RubyGems | sendmux-sending | Sending API | smx_mbx_* | gem install sendmux-sending | packages/ruby/sending |
| RubyGems | sendmux-mailbox | Mailbox API | smx_mbx_* | gem install sendmux-mailbox | packages/ruby/mailbox |
| RubyGems | sendmux-management | Management API | smx_root_* | gem install sendmux-management | packages/ruby/management |
| RubyGems | sendmux-sdk | Ruby umbrella package | surface-specific | gem install sendmux-sdk | packages/ruby/sdk |
Quick start
Install only the package for the surface you need.
npm install @sendmux/sending
pip install sendmux-sending
go get sendmux.ai/go@v1.0.0
cargo add sendmux
composer require sendmux/sending:^1.0
gem install sendmux-sending
Use mailbox-compatible smx_mbx_* or smx_agent_* tokens for Sending and Mailbox clients. Use root smx_root_* keys for Management clients. Agent tokens remain limited by server-side scopes.
For command-line access, install the CLI:
brew install sendmux/tap/sendmux
npm install -g @sendmux/cli
sendmux --help
For MCP clients, install sendmux-mcp or connect to the hosted MCP endpoint:
pip install sendmux-mcp
sendmux-mcp-mailbox --help
The hosted product MCP endpoint is https://mcp.sendmux.ai/mcp. Local MCP commands support stdio and HTTP transports; hosted MCP uses OAuth.
Repository structure
| Path | Purpose |
|---|---|
packages/ts | TypeScript SDK packages and the sendmux CLI. |
packages/python | Python SDK packages and the sendmux-mcp package. |
go | Go module sendmux.ai/go and subpackages. |
rust | Rust crate published as sendmux on crates.io. |
packages/php | PHP package sources used for Packagist packages and public split repositories. |
packages/ruby | RubyGem package sources. |
codegen | Generator configuration and templates. |
scripts | Generation, verification, publishing, and release helper scripts. |
docs | Surface-coverage and live E2E audit artefacts. |
.github/workflows | CI, canary, live E2E, and release workflows. |
Versioning and support
SDK packages track the Sendmux public API contracts. Patch versions can differ between packages when a fix only affects one ecosystem or runtime.
Generated clients are built from committed OpenAPI snapshots. Any API contract change must update the snapshots and generated output in the same change.
For help, open a GitHub issue with the package name, version, command or import path, and the request ID from any API error response.
Contributing
Open pull requests against this repository. Keep generated output, source snapshots, and verification artefacts together in the same change.
Security issues should be reported through GitHub Security Advisories.
Licence
This repository is available under the MIT licence.
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