Koskamo

Emailens MCP

An open-source Model Context Protocol server that allows AI agents to analyze, audit, fix, and diff HTML, MJML, Maizzle, and React Email across 21 email clients. It runs locally via the @emailens/engine, providing compatibility scores, dark mode simulation, and structured fix prompts without requiring API calls or signups.

Visit Emailens

Package and access

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

Emailens MCP logo, by EmailensCommunity listingLocal stdioSource reviewed; not executedPublished by Emailens
Vendor documentation

What you can do with it

  • Analyze CSS compatibility across 21 email clients
  • Audit emails for spam, links, accessibility, and inbox preview issues
  • Fix email HTML with structured CSS and structural changes
  • Diff two HTML versions to see score changes and regressions

Source and maintenance

Community listingRegistry 0.15.0
mcp-registry: io.github.emailens/mcp@0.15.0Source repositoryProject website
Maintenance checked

Packages and installation

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

@emailens/mcp 0.15.0

npmnpx
@emailens/mcp package definition
{
  "version": "0.15.0",
  "transport": "stdio",
  "identifier": "@emailens/mcp",
  "runtimeHint": "npx",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "EMAILENS_API_KEY",
      "description": "API key for screenshots and sharing. Get one free at app.emailens.dev/dashboard/api"
    }
  ]
}

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": {
    "emailens-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@emailens/mcp@0.15.0"
      ],
      "env": {
        "EMAILENS_API_KEY": "<YOUR_EMAILENS_API_KEY>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.
Cline configuration
{
  "mcpServers": {
    "emailens-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@emailens/mcp@0.15.0"
      ],
      "env": {
        "EMAILENS_API_KEY": "<YOUR_EMAILENS_API_KEY>"
      }
    }
  }
}

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": {
    "emailens-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@emailens/mcp@0.15.0"
      ],
      "env": {
        "EMAILENS_API_KEY": "<YOUR_EMAILENS_API_KEY>"
      }
    }
  }
}

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": {
    "emailens-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@emailens/mcp@0.15.0"
      ],
      "env": {
        "EMAILENS_API_KEY": "<YOUR_EMAILENS_API_KEY>"
      }
    }
  }
}

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