Catalog/Business data/Superpowers email preflight

Check an email campaign before sending

Liveby Superpowers email preflight

Checks an email campaign before you send it: links, UTM tags, images, size, preheader and unsubscribe link.

Follows every link (status, redirect chains, link shorteners, link text that shows one domain while the link goes to another), checks UTM tags are present on your own links and match the values you expect, loads every image (broken, http instead of https, heavy files, missing alt text), measures the HTML against Gmail's 102 KB clipping limit, finds the preheader and the unsubscribe link Gmail and Yahoo require of bulk senders, and checks mobile basics. With from_domain it also audits SPF, DKIM and DMARC. Returns a score, findings with plain fixes and a review sheet.

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For developersSummary, tool id, API call and input schema

Email campaign preflight API by Superpowers email preflight, callable through Superpowers. It is free with any Superpowers account. Call it with one API key: POST /v1/run with "tool": "emailcheck.preflight", or over MCP with run_tool.

Tool id

Call it

Also over MCP as run_tool

curl -X POST https://superpowers.tools/v1/run \
  -H 'Authorization: Bearer $SP_KEY' \
  -d '{"tool":"emailcheck.preflight","input":{"html":""},"idempotency_key":"example-request-1"}'

Input

6 fields · all optional

{
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "html": {
      "type": "string",
      "maxLength": 800000,
      "description": "The email HTML as it will be sent"
    },
    "url": {
      "type": "string",
      "format": "uri",
      "maxLength": 2000,
      "description": "Instead of html: a public \"view in browser\" link of the email"
    },
    "from_domain": {
      "type": "string",
      "maxLength": 253,
      "description": "Sending domain, e.g. news.example.com; adds an SPF/DKIM/DMARC check"
    },
    "expected_utm": {
      "type": "object",
      "additionalProperties": false,
      "description": "UTM values every tracked link should carry, e.g. {\"source\":\"newsletter\",\"campaign\":\"black-friday\"}",
      "properties": {
        "source": {
          "type": "string",
          "maxLength": 100
        },
        "medium": {
          "type": "string",
          "maxLength": 100
        },
        "campaign": {
          "type": "string",
          "maxLength": 100
        }
      }
    },
    "own_domains": {
      "type": "array",
      "items": {
        "type": "string",
        "maxLength": 253
      },
      "maxItems": 10,
      "description": "Your own site domains; links to them should carry UTM tags (default: domains of the most linked site)"
    },
    "max_links": {
      "type": "integer",
      "minimum": 1,
      "maximum": 60,
      "default": 40,
      "description": "How many distinct links to follow"
    }
  }
}