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Emailens MCP

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io.github.emailens/mcpv0.13.0

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

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analyze_email Read-only

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

htmlstring, required

The email HTML source code

formatstring

Input format for framework-specific fix snippets

Emailens MCP MCP server | mcptry

Tools (13)

analyze_email

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

read-only

Argument	Type	Description
html*	string	The email HTML source code
format	string	Input format for framework-specific fix snippets

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "html"
  ],
  "properties": {
    "html": {
      "type": "string",
      "description": "The email HTML source code"
    },
    "format": {
      "enum": [
        "html",
        "jsx",
        "mjml",
        "maizzle"
      ],
      "type": "string",
      "description": "Input format for framework-specific fix snippets"
    }
  }
}

audit_email

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

read-only

Argument	Type	Description
html*	string	The email HTML source code
skip	array	Checks to skip
format	string	Input format

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "html"
  ],
  "properties": {
    "html": {
      "type": "string",
      "description": "The email HTML source code"
    },
    "skip": {
      "type": "array",
      "items": {
        "enum": [
          "spam",
          "links",
          "accessibility",
          "images",
          "compatibility",
          "inboxPreview",
          "size",
          "templateVariables",
          "overflow",
          "visual"
        ],
        "type": "string"
      },
      "description": "Checks to skip"
    },
    "format": {
      "enum": [
        "html",
        "jsx",
        "mjml",
        "maizzle"
      ],
      "type": "string",
      "description": "Input format"
    }
  }
}

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.

Argument	Type	Description
format	string	Output framework: 'html' (default), 'jsx', 'mjml', or 'maizzle'
intent*	string	What the email should be and contain , the brief to build from
seedHtml	string	Optional existing code to improve from instead of starting blank
threshold	number	Target compatibility score, 50-100 (default 90)
maxIterations	number	Max repair rounds, 1-8 (default 5)

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "intent"
  ],
  "properties": {
    "format": {
      "enum": [
        "html",
        "jsx",
        "mjml",
        "maizzle"
      ],
      "type": "string",
      "description": "Output framework: 'html' (default), 'jsx', 'mjml', or 'maizzle'"
    },
    "intent": {
      "type": "string",
      "description": "What the email should be and contain , the brief to build from"
    },
    "seedHtml": {
      "type": "string",
      "description": "Optional existing code to improve from instead of starting blank"
    },
    "threshold": {
      "type": "number",
      "description": "Target compatibility score, 50-100 (default 90)"
    },
    "maxIterations": {
      "type": "number",
      "description": "Max repair rounds, 1-8 (default 5)"
    }
  }
}

check_deliverability

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

read-only

Argument	Type	Description
domain*	string	Domain to check (e.g. 'company.com')

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "pattern": "^[a-z0-9]([a-z0-9-]*[a-z0-9])?(\\.[a-z0-9]([a-z0-9-]*[a-z0-9])?)+$",
      "minLength": 3,
      "description": "Domain to check (e.g. 'company.com')"
    }
  }
}

diff_emails

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

read-only

Argument	Type	Description
after*	string	Modified email HTML
before*	string	Original email HTML
format	string	Input format

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "before",
    "after"
  ],
  "properties": {
    "after": {
      "type": "string",
      "description": "Modified email HTML"
    },
    "before": {
      "type": "string",
      "description": "Original email HTML"
    },
    "format": {
      "enum": [
        "html",
        "jsx",
        "mjml",
        "maizzle"
      ],
      "type": "string",
      "description": "Input format"
    }
  }
}

fix_email

Generate a structured fix prompt for email compatibility issues.

read-only

Argument	Type	Description
html*	string	The email HTML source code to fix
scope	string	Fix scope
format	string	Input format , controls fix syntax
selectedClientId	string	Client ID for scoped fixes

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "html"
  ],
  "properties": {
    "html": {
      "type": "string",
      "description": "The email HTML source code to fix"
    },
    "scope": {
      "enum": [
        "all",
        "current"
      ],
      "type": "string",
      "description": "Fix scope"
    },
    "format": {
      "enum": [
        "html",
        "jsx",
        "mjml",
        "maizzle"
      ],
      "type": "string",
      "description": "Input format , controls fix syntax"
    },
    "selectedClientId": {
      "type": "string",
      "description": "Client ID for scoped fixes"
    }
  }
}

get_build_status

Check a build_email run by runId , returns status, iteration, best compatibility score, and the current best source once available.

read-only

Argument	Type	Description
runId*	string	The runId returned by build_email

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "runId"
  ],
  "properties": {
    "runId": {
      "type": "string",
      "description": "The runId returned by build_email"
    }
  }
}

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.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}

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.

read-only

Argument	Type	Description
html*	string	The email HTML source code
format	string	Input format: 'html' (default), 'jsx', 'mjml', or 'maizzle'
clients	array	Optional client ID filter

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "html"
  ],
  "properties": {
    "html": {
      "type": "string",
      "description": "The email HTML source code"
    },
    "format": {
      "enum": [
        "html",
        "jsx",
        "mjml",
        "maizzle"
      ],
      "type": "string",
      "description": "Input format: 'html' (default), 'jsx', 'mjml', or 'maizzle'"
    },
    "clients": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Optional client ID filter"
    }
  }
}

sandbox_get_inbox

Retrieve or auto-create your Emailens sandbox test email address for capturing test emails.

Argument	Type	Description
name	string	Optional friendly name for the sandbox inbox

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "name": {
      "type": "string",
      "description": "Optional friendly name for the sandbox inbox"
    }
  }
}

sandbox_get_message

Get complete email details: HTML/text body, parsed headers, spam score, SPF/DKIM/DMARC auth status, and validated links.

read-only

Argument	Type	Description
messageId*	string	ID of the sandbox message

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "messageId"
  ],
  "properties": {
    "messageId": {
      "type": "string",
      "description": "ID of the sandbox message"
    }
  }
}

sandbox_list_messages

List recently captured test emails in the Emailens sandbox.

read-only

Argument	Type	Description
inboxId	string	Optional inbox ID filter

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "inboxId": {
      "type": "string",
      "description": "Optional inbox ID filter"
    }
  }
}

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).

read-only

Argument	Type	Description
sender	string	Substring match for sender address (case-insensitive)
inboxId	string	Optional inbox ID filter
subject	string	Substring match for email subject (case-insensitive)
timeoutSeconds	number	Max seconds to wait (default: 30, max: 60)

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "sender": {
      "type": "string",
      "description": "Substring match for sender address (case-insensitive)"
    },
    "inboxId": {
      "type": "string",
      "description": "Optional inbox ID filter"
    },
    "subject": {
      "type": "string",
      "description": "Substring match for email subject (case-insensitive)"
    },
    "timeoutSeconds": {
      "type": "number",
      "description": "Max seconds to wait (default: 30, max: 60)"
    }
  }
}