MCP server

Emailens MCP Official

io.github.emailens/mcp

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

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

Website Source

At a glance

Type

MCP server

Publisher

emailens.dev (verified by the MCP Registry)

Status

Working at last check

Tools

15

Token cost

About 3,697 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

25 Oct 2026, 20:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"emailens":{"type":"http","url":"https://emailens.dev/api/mcp"}}}

Antigravity

agy mcp add emailens https://emailens.dev/api/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"emailens","server_url":"https://emailens.dev/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"emailens","server_url":"https://emailens.dev/api/mcp"}

Tools

• analyze_email ~582 tokens
  Fix error and warning findings. Info findings are not problems (the email falls back safely there): never remove responsive (@media) or dark-mode CSS to clear them. Quick CSS compatibility analysis, returns per-client scores and one finding per problem, listing the clients it affects. For HTML input
• audit_email ~1020 tokens
  Fix error and warning findings, and restore anything listed in designRemovals. Info findings are not problems (the email falls back safely there): never remove responsive (@media), dark-mode CSS or rounded corners to clear them. designRemovals compares this version with the first one audited for the
• build_email ~284 tokens
  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.
• capture_screenshots ~228 tokens
  Capture real email screenshots across 21 clients (Gmail, Outlook, Apple Mail, etc.) with light and dark mode variants. Screenshots are rendered in real browsers and hosted on CDN.
• check_deliverability ~118 tokens
  Check email deliverability for a domain , SPF, DKIM, DMARC, MX, BIMI.
• diff_emails ~139 tokens
  Compare two email HTML versions , shows score changes, fixed issues, and regressions per client.
• fix_email ~163 tokens
  Generate a structured fix prompt for email compatibility issues.
• get_build_status ~107 tokens
  Check a build_email run by runId , returns status, iteration, best compatibility score, and the current best source once available.
• list_clients ~98 tokens
  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_email ~348 tokens
  Full email compatibility preview , transforms HTML for 21 email clients, analyzes CSS, generates scores, simulates dark mode, checks inbox preview and email size.
• sandbox_get_inbox ~92 tokens
  Retrieve or auto-create your Emailens sandbox test email address for capturing test emails.
• sandbox_get_message ~104 tokens
  Get complete email details: HTML/text body, parsed headers, spam score, SPF/DKIM/DMARC auth status, and validated links.
• sandbox_list_messages ~80 tokens
  List recently captured test emails in the Emailens sandbox.
• sandbox_wait_for_email ~183 tokens
  Poll and wait for a matching incoming test email in the sandbox (ideal for auth OTPs, magic links, transactional email assertions).
• share_preview ~151 tokens
  Create a shareable link for an email preview. Recipients see the full analysis without needing an account. Requires the Dev plan or above.

Browse

• GitHub tools
• Website monitoring
• Website screenshots
• Email
• GitHub and code hosting

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