Emailens MCP
Analyze, audit, fix and diff HTML, MJML, Maizzle and React Email across 21 email clients.
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What it can do
What data it sees
Do you need an account
No: the server works without sign-in
Analyze, audit, fix and diff HTML, MJML, Maizzle and React Email across 21 email clients.
Server tool list (9)
Raw names from tools/list. Only developers need these.
| 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. |