Emailens MCP

io.github.emailens/mcpVersion 0.16.0

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

Status

Responds304 msNov 14, 2026, 14:50 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:50 UTC
Latency: 304 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 21:12 UTC

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Connect

Streamable HTTP

https://emailens.dev/api/mcpResponds304 msNov 14, 2026, 14:50 UTC

No sign-in

Claude Code

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

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: emailens
Remote MCP server URL: https://emailens.dev/api/mcp

Cursor

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

VS Code

code --add-mcp '{"name":"emailens","type":"http","url":"https://emailens.dev/api/mcp"}'

Streamable HTTP

npm: @emailens/mcp 0.16.0

Package only

npm (npx)

claude mcp add emailens -- npx -y @emailens/mcp@0.16.0

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Tools

15 tools

Tools of Emailens MCP
	Description		Read-only	Idempotent	Open world
`analyze_email`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 each finding carries loc (line, column, offset) and alsoAtLines, so you can edit the exact source. Narrow with clients, or pass detail:'full' for the per-client breakdown with fix snippets. Use audit_email for a full quality report (spam, links, a11y, images, etc.).	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 each finding carries loc (line, column, offset) and alsoAtLines, so you can edit the exact source. Narrow with clients, or pass detail:'full' for the per-client breakdown with fix snippets. Use audit_email for a full quality report (spam, links, a11y, images, etc.).	No	Yes	Yes	No
`audit_email`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 same email (or with previousHtml): design the edits deleted, such as @media rules, dark mode, corners, gradients, VML fallbacks or images. Comprehensive email quality audit: CSS compatibility, spam scoring, link validation, accessibility, images, inbox preview, size (Gmail clipping), template variables, content overflow, visual fallbacks, dark-mode and mobile text contrast, design consistency, structural faults in Outlook-only VML, style survival (CSS a client parses and then discards, such as a stylesheet past Gmail's 16 KB ceiling or every rule after a `}}`), and client targeting (HowToTarget hacks such as Gmail u+.body or MSO conditionals). For HTML input, findings tied to a specific element carry loc (line, column, offset). Compatibility is collapsed to one finding per problem listing the clients it affects; pass detail:'full' for the per-client breakdown with fix snippets. Use skip to omit checks, targetingPolicy to change how targeted scopes affect scores, and clients to narrow which clients are reported.	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 same email (or with previousHtml): design the edits deleted, such as @media rules, dark mode, corners, gradients, VML fallbacks or images. Comprehensive email quality audit: CSS compatibility, spam scoring, link validation, accessibility, images, inbox preview, size (Gmail clipping), template variables, content overflow, visual fallbacks, dark-mode and mobile text contrast, design consistency, structural faults in Outlook-only VML, style survival (CSS a client parses and then discards, such as a stylesheet past Gmail's 16 KB ceiling or every rule after a `}}`), and client targeting (HowToTarget hacks such as Gmail u+.body or MSO conditionals). For HTML input, findings tied to a specific element carry loc (line, column, offset). Compatibility is collapsed to one finding per problem listing the clients it affects; pass detail:'full' for the per-client breakdown with fix snippets. Use skip to omit checks, targetingPolicy to change how targeted scopes affect scores, and clients to narrow which clients are reported.	No	Yes	Yes	No
`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.	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.	No	No	No	No
`capture_screenshots`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.	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.	No	No	No	Yes
`check_deliverability`Check email deliverability for a domain , SPF, DKIM, DMARC, MX, BIMI.	Check email deliverability for a domain , SPF, DKIM, DMARC, MX, BIMI.	No	Yes	Yes	Yes
`diff_emails`Compare two email HTML versions , shows score changes, fixed issues, and regressions per client.	Compare two email HTML versions , shows score changes, fixed issues, and regressions per client.	No	Yes	Yes	No
`fix_email`Generate a structured fix prompt for email compatibility issues.	Generate a structured fix prompt for email compatibility issues.	No	Yes	Yes	No
`get_build_status`Check a build_email run by runId , returns status, iteration, best compatibility score, and the current best source once available.	Check a build_email run by runId , returns status, iteration, best compatibility score, and the current best source once available.	No	Yes	Yes	No
`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.	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.	No	Yes	Yes	No
`preview_email`Full email compatibility preview , transforms HTML for 21 email clients, analyzes CSS, generates scores, previews dark mode, checks inbox preview and email size.	Full email compatibility preview , transforms HTML for 21 email clients, analyzes CSS, generates scores, previews dark mode, checks inbox preview and email size.	No	Yes	Yes	No
`sandbox_get_inbox`Retrieve or auto-create your Emailens sandbox test email address for capturing test emails.	Retrieve or auto-create your Emailens sandbox test email address for capturing test emails.	No	No	Yes	No
`sandbox_get_message`Get complete email details: HTML/text body, parsed headers, spam score, SPF/DKIM/DMARC auth status, and validated links.	Get complete email details: HTML/text body, parsed headers, spam score, SPF/DKIM/DMARC auth status, and validated links.	No	Yes	Yes	No
`sandbox_list_messages`List recently captured test emails in the Emailens sandbox.	List recently captured test emails in the Emailens sandbox.	No	Yes	Yes	No
`sandbox_wait_for_email`Poll and wait for a matching incoming test email in the sandbox (ideal for auth OTPs, magic links, transactional email assertions).	Poll and wait for a matching incoming test email in the sandbox (ideal for auth OTPs, magic links, transactional email assertions).	No	Yes	No	No
`share_preview`Create a shareable link for an email preview. Recipients see the full analysis without needing an account. Requires the Dev plan or above.	Create a shareable link for an email preview. Recipients see the full analysis without needing an account. Requires the Dev plan or above.	No	No	No	Yes

Details

Registry status: Active
Published: Nov 12, 2026
Updated: Nov 12, 2026
Website: https://emailens.dev/mcp⁠ (opens in a new tab)
Repository: https://github.com/emailens/mcp⁠ (opens in a new tab)
Categories (suggested): CommunicationSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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