Emailens MCP Server

by emailens Your server? Claim it

answering

Emailens MCP is answering right now. Last checked 4 min ago. 66 installs a week from npm. It exposes 9 tools. Last commit 14 Sep 2026.

Analyze, audit, fix and diff HTML, MJML, Maizzle and React Email across 21 email clients.

Installs per day peak 313 · avg 38 · +42% w/w

a month agotoday

Uptime history 51 days of history · worst day 50%

51 days agonow

97.8%

Uptime 24h

89 of 91 checks

Tools

read from the server

367 ms

Response time

average over 24h

Installs / week

npm and PyPI

Emailens MCP does not always answer

Over the last week it answered 95.8% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 4 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mcp --transport http https://emailens.dev/api/mcp

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

{
  "mcpServers": {
    "mcp": {
      "url": "https://emailens.dev/api/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://emailens.dev/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://emailens.dev/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mcp": {
      "url": "https://emailens.dev/api/mcp"
    }
  }
}

This one needs environment variables set before it will start: EMAILENS_API_KEY (API key for screenshots and sharing. Get one free at emailens.dev/settings/api-keys). The author declared them in the registry entry; get the values from the project itself.

Available tools 9

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

build

build_email

Generate a cross-client-compatible email from a brief using Emailens's self-healing loop (generate → score across 21 clients → repair). Output stays in the framework you choose. Returns a runId immediately , poll get_build_status for progress and the final code. Requires a Pro/Team API key.

get_build_status

Check a build_email run by runId , returns status, iteration, best compatibility score, and the current best source once available.

analyze

analyze_email

Quick CSS compatibility analysis , returns warnings and per-client scores.

audit

audit_email

Comprehensive quality audit , CSS compatibility, spam, links, accessibility, images, inbox preview, size, templates, content overflow, visual bugs.

clients

list_clients

List all 21 supported email clients with IDs, names, rendering engines, dark mode support, and deprecation status. Use the returned IDs to filter other tools like preview_email or capture_screenshots.

deliverability

check_deliverability

Check email deliverability for a domain , SPF, DKIM, DMARC, MX, BIMI.

diff

diff_emails

Compare two email HTML versions , shows score changes, fixed issues, and regressions per client.

fix

fix_email

Generate a structured fix prompt for email compatibility issues.

preview

preview_email

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

Endpoints

URL	Transport	State	Latency	Checked
https://emailens.dev/api/mcp	streamable-http	answering	254 ms	4 min ago

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Emailens MCP — questions

Answers built from our own checks of this server.

What can Emailens MCP do?

It exposes 9 tools, read directly from the server on our last check. Among them: analyze_email, audit_email, build_email, check_deliverability, diff_emails, fix_email and 3 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Emailens MCP working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 89 of 91 checks got a reply (97.8%), average response time 367 ms. The bar chart above shows every period we have measured.

How do I connect Emailens MCP?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Emailens MCP need an API key?

No. Emailens MCP completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 9 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Emailens MCP?

It answers our handshake in 367 ms on average, which is faster than 44% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

How many people use Emailens MCP?

The npm package @emailens/mcp was installed 66 times in the last week. Week over week that is +42%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Emailens MCP open source?

Yes — it is published under the MIT licence, written in TypeScript, 7 stars on GitHub and 1 open issue. The source link is on this page, so you can read exactly what it does with your data before you connect it.