Sendmux Sdk vs Jmap MCP

In-depth architectural comparison of the Sendmux Sdk and Jmap MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Sendmux Sdk when:

• You need dedicated capabilities in the Communication domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: OAuth 2.0 (Freemium).
• You have access to required keys: SENDMUX_OAUTH_CLIENT_ID, SENDMUX_OAUTH_CLIENT_SECRET, SENDMUX_API_KEY.
• Primary tools included: Supports Sendmux hosted and local MCP deployments, Provides mailbox API for email retrieval and search, Supports sending emails via Sendmux sending API.

Explore Sendmux Sdk Details

Choose Jmap MCP when:

• You need dedicated capabilities in the Communication domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: API Key required (BYOK (Pay Provider Direct)).
• You have access to required keys: JMAP_SESSION_URL, JMAP_BEARER_TOKEN, JMAP_ACCOUNT_ID.

Feature & Specification Comparison

Specification	Sendmux Sdk Sendmux Communication	Jmap MCP wyattjoh Communication
Summary	Email inbox API MCP server for AI agents to receive, search, and send mail through hosted or local Sendmux Product MCP.	A Model Context Protocol (MCP) server that provides tools for interacting with JMAP (JSON Meta Application Protocol) email servers. Built with Deno and using the jmap-jam client library.
Category & Scope	Communication

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "sendmux-sendmux-sdk": {
      "command": "uvx",
      "args": [
        "sendmux-core"
      ],
      "env": {
        "SENDMUX_OAUTH_CLIENT_ID": "YOUR_SENDMUX_OAUTH_CLIENT_ID_HERE",
        "SENDMUX_OAUTH_CLIENT_SECRET": "YOUR_SENDMUX_OAUTH_CLIENT_SECRET_HERE",
        "SENDMUX_API_KEY": "YOUR_SENDMUX_API_KEY_HERE"
      }
    }
  }
}

{
  "mcpServers": {
    "wyattjoh-jmap-mcp": {
      "url": "https://api.fastmail.com/jmap/session"
    }
  }
}

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