Mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.

How do I install Mcp?

Mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.

Mcp provides 9 tools: preview_email, analyze_email, audit_email, fix_email, list_clients and 4 more. See the full tools list on the server page for descriptions and parameters.

What AI clients work with Mcp?

Mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and http transport.

Is Mcp actively maintained?

Mcp is actively maintained — last commit was 0 days ago. It has 6 GitHub stars.

MCP

@emailens/mcp

Email compatibility analysis across 15 clients — preview, audit, fix, diff, deliverability.

6 400/wk 9 tools GitHub npm

No known CVEs

MIT license

Actively maintained

Last commit 0d ago

Works with most clients

Transport: stdio, http

9 tools · ~1.1k tok

Grade B · 0.6% of 200K ctx

MCPpedia last refreshed this data 7h ago

Edit this pageView history

MCP is an MCP server that email compatibility analysis across 15 clients — preview, audit, fix, diff, deliverability. Its tool list has not been published yet over stdio and http, requires no API key, and scores 85/100 on MCPpedia's security, maintenance and efficiency rubric.

Communication Developer Tools

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "emailens": {
      "args": [
        "-y",
        "@emailens/mcp"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-emailens-mcp)](https://mcppedia.org/s/io-github-emailens-mcp)

Read me

What Mcp does

MCP server for email compatibility analysis. Analyze, preview, diff, and fix HTML emails across 15 email clients — plus capture real screenshots and create shareable links with an optional API key.

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y '@emailens/mcp' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

85/100across 5 weighted dimensions

How we score →

0255075100

−15

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked @emailens/mcp against OSV.dev.

Inventory

Tools (9)

Click any tool to inspect its schema.

~1.1k tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Mcp safe to use?: Mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Mcp?: Mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Mcp do?: Mcp provides 9 tools: preview_email, analyze_email, audit_email, fix_email, list_clients and 4 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Mcp?: Mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and http transport.
Is Mcp actively maintained?: Mcp is actively maintained — last commit was 0 days ago. It has 6 GitHub stars.

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MCP Security Weekly

Get CVE alerts and security updates for Mcp and similar servers.

Community

Discussion

Start a conversation

Ask a question, share a tip, or report an issue.

Has anyone used this with Cursor?How do you handle auth?Any alternatives?

Edit this pageView history

Communication Developer Tools

Step 1

Install in your client

Config is the same across clients — only the file and path differ.

Supported in Claude Desktopstdio, http · Node 18+

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "emailens": {
      "args": [
        "-y",
        "@emailens/mcp"
      ],
      "command": "npx"
    }
  }
}

Are you the author?

Add this badge to your README to show your security score and help users find safe servers.

Embed in your READMEAbout badges →

[![MCPpedia Score](https://mcppedia.org/api/badge/io-github-emailens-mcp)](https://mcppedia.org/s/io-github-emailens-mcp)

Read me

What Mcp does

MCP server for email compatibility analysis. Analyze, preview, diff, and fix HTML emails across 15 email clients — plus capture real screenshots and create shareable links with an optional API key.

Test This Server

Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.

npx -y '@emailens/mcp' 2>&1 | head -1 && echo "✓ Server started successfully"

After testing, let us know if it worked:

README

Email rendering analysis for AI assistants

MCP server for email compatibility analysis. Analyze, preview, diff, and fix emails across 21 email clients — plus capture real screenshots and create shareable links with an optional API key.

Send HTML, MJML, Maizzle or React Email. Set format and the template is compiled before analysis, so what gets checked is the HTML your readers actually receive.

Why your assistant needs this: across the 255 CSS and HTML features we track, only 6 are fully supported in every major email client (see the data). Ask Claude to check your email before you send it.

Built on @emailens/engine. Also available as a GitHub Action.

Install

npx -y @emailens/mcp

Setup

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "emailens": {
      "command": "npx",
      "args": ["-y", "@emailens/mcp"]
    }
  }
}

Claude Code

claude mcp add emailens -- npx -y @emailens/mcp

With API Key (optional — unlocks screenshots + sharing)

{
  "mcpServers": {
    "emailens": {
      "command": "npx",
      "args": ["-y", "@emailens/mcp"],
      "env": {
        "EMAILENS_API_KEY": "ek_live_..."
      }
    }
  }
}

Get your free API key at emailens.dev/settings/api-keys.

Remote (no install)

Use the hosted endpoint — no npm or Node.js needed. API key required.

{
  "mcpServers": {
    "emailens": {
      "url": "https://emailens.dev/api/mcp",
      "headers": {
        "Authorization": "Bearer ek_live_..."
      }
    }
  }
}

Tools

Local Tools (no account needed)

`preview_email`

Full email compatibility preview — transforms HTML for 21 clients, analyzes CSS, generates scores, simulates dark mode, checks inbox preview and email size.

Parameter	Type	Required	Description
`html`	string	Yes	Email HTML source
`clients`	string[]	No	Filter to specific client IDs
`format`	enum	No	`"html"`, `"jsx"`, `"mjml"`, `"maizzle"`

`analyze_email`

Quick CSS compatibility analysis — returns per-client scores and one finding per problem. Faster than audit_email when you only need CSS compatibility.

Parameter	Type	Required	Description
`html`	string	Yes	Email HTML source
`format`	enum	No	Input format
`detail`	enum	No	`"summary"` (default) or `"full"`
`clients`	string[]	No	Only report these client IDs

One finding per problem, not one per client. The engine reports per client because a score is per client, and per selector because a fix is per selector. On an ordinary newsletter border-radius arrives twelve times — two clients that drop it, six selectors that use it — with the same sentence in every copy. That was 286KB of JSON, about 73,000 tokens, for an 11KB email.

Findings group by property, severity and message, listing the clients affect

... View full README on GitHub

Loading README…

Scored, not listed

Why this score

Five weighted categories — click any category to see the underlying evidence.

Score breakdown

85/100across 5 weighted dimensions

How we score →

0255075100

−15

Security

Maintenance

Efficiency

Documentation

Compatibility

Categoriesclick a row to see evidence

Security

OSV.dev

No known CVEs.

Checked @emailens/mcp against OSV.dev.

Inventory

Tools (9)

Click any tool to inspect its schema.

~1.1k tokens total

Community

Reviews

Be the first to review

Have you used this server?

Share your experience — it helps other developers decide.

How easy was setup?Did it work reliably?How was the documentation?

Frequently Asked Questions

Is Mcp safe to use?: Mcp has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under MIT.
How do I install Mcp?: Mcp supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
What can Mcp do?: Mcp provides 9 tools: preview_email, analyze_email, audit_email, fix_email, list_clients and 4 more. See the full tools list on the server page for descriptions and parameters.
What AI clients work with Mcp?: Mcp is compatible with claude-desktop, cursor, claude-code. It uses stdio and http transport.
Is Mcp actively maintained?: Mcp is actively maintained — last commit was 0 days ago. It has 6 GitHub stars.