Emailens MCP

io.github.emailens/mcp

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

healthy

status

tools exposed

2220ms

connect latency

ca681cc4f37c

schema fingerprint

Tools (9)

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.

analyze_email

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

audit_email

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

fix_email

Generate a structured fix prompt for email compatibility issues.

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.

diff_emails

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

check_deliverability

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

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.

Endpoint

https://emailens.dev/api/mcp
Category: Communication · Last checked: 2026-08-15T09:52:39Z

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How we measure →

What this means. This server responded to the MCP handshake and listed its tools without authentication. The schema fingerprint lets us flag if tool signatures silently change (schema drift) between checks.