Emailens MCP - install, status & alternatives [2026]

01 · Install Emailens MCP

before you install - you'll need

EMAILENS_API_KEY

Environment variables documented in the project's README - it lists which are required and which have defaults.

Claude Code

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

Claude Desktop / Cursor / VS Code - add to config

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

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://emailens.dev/api/mcp

transport: streamable-http

endpoint alive - responded to MCP initialize · probed 2026-08-25

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to emailens.dev

endpoint auth accepted our unauthenticated MCP initialize - no credentials needed to connect

license MIT - declared in the repository

npm package @emailens/mcp - published under the repo owner's npm scope (@emailens)

registry namespace io.github.emailens is GitHub-verified and matches the repo owner

03 · What Emailens MCP can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can generate a structured fix prompt for compatibility issues. Returns markdown with fix instructions that the AI can apply directly, list all 21 supported email clients with IDs, names, engines, and dark mode support, compare two email HTML versions - shows score changes, fixed issues, and introduced issues per client, and check email deliverability for a domain - SPF, DKIM, DMARC, MX, BIMI records with a score and actionable issues.

Capability map

Tools grouped from the project's README - what Emailens MCP lets an agent do.

Preview

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

preview_email

Analyze

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

analyze_email

Audit

1 tool - e.g. Comprehensive quality audit - CSS compatibility, spam scoring, link validation, accessibility, images, inbox preview, size (Gmail clipping), template variables,

audit_email

Fix

1 tool - e.g. Generate a structured fix prompt for compatibility issues. Returns markdown with fix instructions that the AI can apply directly.

fix_email

read & search

1 tool - e.g. List all 21 supported email clients with IDs, names, engines, and dark mode support.

list_clients

Diff

1 tool - e.g. Compare two email HTML versions - shows score changes, fixed issues, and introduced issues per client.

diff_emails

Check

1 tool - e.g. Check email deliverability for a domain - SPF, DKIM, DMARC, MX, BIMI records with a score and actionable issues.

check_deliverability

Capture

1 tool - e.g. Capture real email screenshots across 21 clients in real browsers. Screenshots are hosted on CDN.

capture_screenshots

04 · Who maintains Emailens MCP

Emailens MCP is maintained by emailens. It's the only MCP server we track from this author; the repo dates to Feb 2026.

05 · Facts

repository: github.com/emailens/mcp
website: https://emailens.dev/mcp
category: email - ranked #19 of 75 actively-maintained email servers as of 2026-08-25.
registry: io.github.emailens/mcp (active, first published 2026-04-01 · 2 versions)
packages: npm:@emailens/mcp

06 · Emailens MCP FAQ

Is Emailens MCP still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-23. We re-verify nightly.

What can Emailens MCP do?

With this server connected, an agent can generate a structured fix prompt for compatibility issues. Returns markdown with fix instructions that the AI can apply directly, list all 21 supported email clients with IDs, names, engines, and dark mode support, compare two email HTML versions - shows score changes, fixed issues, and introduced issues per client, and check email deliverability for a domain - SPF, DKIM, DMARC, MX, BIMI records with a score and actionable issues.

How do I install Emailens MCP?

Run `npx -y @emailens/mcp`. The README documents one environment variable (EMAILENS_API_KEY) to set first. You can also paste the ready-made client config above.

Does Emailens MCP require authentication?

No - the endpoint accepted our unauthenticated MCP initialize when probed on 2026-08-25; you can connect without credentials.

07 · Alternatives to Emailens MCP

Alternatives to Emailens MCP

Maintained email servers if Emailens MCP isn't the fit.

More email MCP servers · GBG Loqate - Reach · Multi Gmail MCP · Hail · Claw Link

More TypeScript MCP servers · Source Library · Emilia Protocol · En Convert · GB Studio MCP Server · AI Diagram Maker · see all