Emailens MCP server

by emailens·io.github.emailens/mcp·v0.6.2

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

A85/100grade A

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Safety scan

A85/100

full report

Adoption

Growing

7 stars66 downloads/wk

Reviews

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Emailens MCP tools (9, 5 write)

write = sends, deletes, buys or posts

analyze_emailwrite actionFree
Quick CSS compatibility analysis , returns warnings and per-client scores.
audit_emailwrite actionFree
Comprehensive quality audit , CSS compatibility, spam, links, accessibility, images, inbox preview, size, templates, content overflow, visual bugs.
build_emailwrite actionFree
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.
check_deliverabilityFree
Check email deliverability for a domain , SPF, DKIM, DMARC, MX, BIMI.
diff_emailsFree
Compare two email HTML versions , shows score changes, fixed issues, and regressions per client.
fix_emailwrite actionFree
Generate a structured fix prompt for email compatibility issues.
get_build_statusFree
Check a build_email run by runId , returns status, iteration, best compatibility score, and the current best source once available.
list_clientsFree
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.
preview_emailwrite actionFree
Full email compatibility preview , transforms HTML for 21 email clients, analyzes CSS, generates scores, simulates dark mode, checks inbox preview and email size.

Public scan report

scanner v0.1.9 · 2026-09-21 · same rubric, same numbers if you re-run it

1 high

Code scan2 source files scanned25/25
Live reliabilityremote reachable in 831ms20/20
Tool poisoning9 tool descriptions checked15/15
Auth qualityopen endpoint exposes 5 write-action tools with no auth3/15
Maintenancelast push 7 days ago15/15
Maintainer identityregistry namespace matches repository owner7/10

Findings (1)

highWrite-action tools reachable without authenticationauth.open-write

Overall 85/100. Components that don't apply are left out of the denominator. Any critical finding is an F.Rubric Appeal a finding JSON

What the publisher says

From the Emailens MCP repository's README, as published. We do not edit it. Read it on GitHub

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 298 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 claudedesktopconfig.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.

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.

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.

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Install directly

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

Add to Cursor

Emailens MCP: common questions

Is Emailens MCP server safe?: Yes, by our scan: it is graded A (85/100). Read the Emailens MCP safety report
How do I install Emailens MCP?: It runs remotely at emailens.dev. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Emailens MCP need an API key?: Yes. The registry entry asks for EMAILENS_API_KEY.
Is Emailens MCP maintained?: The last commit was 7 days ago (2026-09-14). The latest release is v0.6.2.
Is Emailens MCP up?: 100% of our last 8 checks got an answer. We check remote servers about four times a day.
What can I use instead of Emailens MCP?: Servers from other publishers that do the same job: emailmd MCP server, BlackVeil DNS & Email Security Scanner MCP server and Apixies Developer API Suite MCP server. Compare all Emailens MCP alternatives.

Alternatives to Emailens MCP

Same job from other publishers: the closest match first, then the best rated.

All Emailens MCP alternatives →

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Emailens MCP vs emailmd Emailens MCP vs BlackVeil DNS & Email Security Scanner Emailens MCP vs Apixies Developer API Suite

Run it through the gateway

With the gateway added, ask your agent for it by name:

agent prompt

call io.github.emailens/mcp → analyze_email

Free per call. Metered, capped by your key, logged for reliability.

Add the gateway (gw.mcp.market)

Rating: —
Safety grade: A · 85/100
Stars: 7
Downloads/wk: 66
Price: Free
Licence: MIT
Transport: Remote · mixed
Uptime: 100% · 8/8 checks
Version: 0.6.2
Category: Email
Last release: 2026-09-14

Credentials it needs

EMAILENS_API_KEYsecretAPI key for screenshots and sharing. Get one free at emailens.dev/settings/api-keys

Endpoint

https://emailens.dev/api/mcp

streamable-http

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