MCP server for email compatibility analysis — preview, analyze, fix, diff, and capture screenshots across 21 email clients via Claude or any
MCP server for email compatibility analysis — preview, analyze, fix, diff, and capture screenshots across 21 email clients via Claude or any MCP-compatible tool. That is what the mcp mcp server brings to an AI assistant: the same capability, reachable through the Model Context Protocol rather than a separate app or dashboard.
The server publishes 9 tools. What each one is for:
preview_email — Full email compatibility preview — transforms HTML for 21 clients, analyzes CSS, generates scores, simulates dark mode, checks inbox preview andanalyze_email — Quick CSS compatibility analysis — returns per-client scores and warnings. Faster than audit_email when you only need CSS compatibilityaudit_email — Comprehensive quality audit — CSS compatibility, spam scoring, link validation, accessibility, images, inbox preview, size (Gmail clipping), templatefix_email — Generate a structured fix prompt for compatibility issues. Returns markdown with fix instructions that the AI can apply directlylist_clients — List all 21 supported email clients with IDs, names, engines, and dark mode supportdiff_emails — Compare two email HTML versions — shows score changes, fixed issues, and introduced issues per clientcheck_deliverability — Check email deliverability for a domain — SPF, DKIM, DMARC, MX, BIMI records with a score and actionable issuescapture_screenshots — Capture real email screenshots across 21 clients in real browsers. Screenshots are hosted on CDNshare_preview — Create a shareable link. Recipients see the full analysis without an accountConfiguration is passed through the environment: EMAILENS_API_KEY. Treat anything key-shaped as a real credential — scope it to the minimum the server needs, and rotate it if it ever lands in a shared config.
Because this one is hosted, setup is mostly authentication — you point your client at the endpoint and approve access. Nothing runs on your machine, so there is no runtime to keep patched.
Among the team communication options, the useful question is rarely "what can it do" but "what does it cost you to run" — permissions, credentials, and how much of your context its toolset consumes. MCP's toolset — preview_email, analyze_email, audit_email and 6 more — is a fair guide to whether it matches your workflow. It is maintained by emailens; worth a glance at recent repository activity before you build anything load-bearing on it.
This entry was verified against MCP's own documentation before publication; SyncDev keeps the directory reviewed rather than auto-generated.
| Tool | What it does |
|---|---|
| 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 warnings. Faster than audit_email when you only need CSS compatibility. |
| audit_email | Comprehensive quality audit — CSS compatibility, spam scoring, link validation, accessibility, images, inbox preview, size (Gmail clipping), template variables, content overflow, and visual bugs. |
| fix_email | Generate a structured fix prompt for compatibility issues. Returns markdown with fix instructions that the AI can apply directly. |
| list_clients | List all 21 supported email clients with IDs, names, engines, and dark mode support. |
| diff_emails | Compare two email HTML versions — shows score changes, fixed issues, and introduced issues per client. |
| check_deliverability | Check email deliverability for a domain — SPF, DKIM, DMARC, MX, BIMI records with a score and actionable issues. |
| capture_screenshots | Capture real email screenshots across 21 clients in real browsers. Screenshots are hosted on CDN. |
| share_preview | Create a shareable link. Recipients see the full analysis without an account. |
{
"mcpServers": {
"emailens": {
"command": "npx",
"args": ["-y", "@emailens/mcp"],
"env": {
"EMAILENS_API_KEY": "ek_live_..."
}
}
}
}Configuration as documented by the project. Restart the client after saving.
| Variable | Description | Required |
|---|---|---|
| EMAILENS_API_KEY | Credential the server authenticates with. | Yes |
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