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Sendmux MCP

Sendmux MCP exposes a curated agent toolset for managing email operations, including mailbox search, reading, organizing, sending, and team resource management. It supports hosted OAuth for browser-based authorization or local stdio execution via PyPI/npm packages, allowing agents to interact with Sendmux's sending, receiving, and management APIs securely.

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Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Sendmux MCP logo, by SendmuxCommunity listingLocal stdioSource reviewed; not executedPublished by Sendmux
You need:Hosted grant with Mailbox access, an smx_mbx_ key, or a scoped smx_agent_ token locallyHosted grant with Management access, or an smx_root_ key locallyHosted grant with Sending access, an smx_mbx_ key, or an owner-approved Sending-resource smx_agent_ token locally
Vendor documentation

What you can do with it

  • Search and read email from granted mailboxes
  • Send single or batch emails via agent tools
  • Manage team resources like domains and billing
  • Search Sendmux documentation and API references

Source and maintenance

Community listingRegistry 2.2.0
mcp-registry: io.github.Sendmux/sendmux-mcp@2.2.0Source repositoryProject website
Maintenance checked

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

sendmux-mcp 1.0.0

npm
sendmux-mcp package definition
{
  "version": "1.0.0",
  "transport": "stdio",
  "identifier": "sendmux-mcp",
  "registryType": "npm"
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.
Cursor configuration
{
  "mcpServers": {
    "sendmux-mcp-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "sendmux-mcp@1.0.0"
      ]
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "sendmux-mcp-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "sendmux-mcp@1.0.0"
      ]
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.
VS Code configuration
{
  "servers": {
    "sendmux-mcp-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "sendmux-mcp@1.0.0"
      ]
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.
Claude Desktop configuration
{
  "mcpServers": {
    "sendmux-mcp-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "sendmux-mcp@1.0.0"
      ]
    }
  }
}

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