Emailmd vs Kaiku

In-depth architectural comparison of the Emailmd and Kaiku 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 Emailmd when:

• You need dedicated capabilities in the Communication domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: Markdown-to-email-safe HTML rendering, Plain-text email output, Deliverability linting.

Explore Emailmd Details

K

Choose Kaiku when:

• You need dedicated capabilities in the Communication domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Kaiku Details

Feature & Specification Comparison

Specification	Emailmd anypost Communication	K Kaiku Communication
Summary	Write and preview emails from your assistant. Renders markdown into email-safe HTML that holds up in Outlook and Gmail, lints drafts for deliverability problems, and returns a live preview link. Hosted with no API key, or run it locally with npx emailmd mcp.	Issue tracker and wiki for teams and their agents: find, file and update issues, write pages.
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": {
    "anypost-emailmd": {
      "command": "npx",
      "args": [
        "-y",
        "emailmd"
      ]
    }
  }
}

{
  "mcpServers": {
    "kaiku": {
      "url": "https://kaiku.tech/en/docs/mcp?utm_source=mcp-registry"
    }
  }
}

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