Email Deliverability Check (SPF, DKIM, DMARC, MX, Blacklists by Domain)

omnial/x402-email-deliverability-check

Given a domain, checks its SPF, DKIM, DMARC, and MX DNS configuration plus common email blacklists, and returns a 0-100 deliverability score with a letter grade, the specific issues found, and plain-language recommendations to fix them. The score checks that the records exist and parse, not that the domain sends mail: in testing a domain with an empty MX host and a reject-all SPF record scored 100, and DKIM is looked up only under common selector names, so a domain signing under another selector reads as having none.

activeper callv5

Price

Up to $0.0811 per call; you pay what the call used

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.00.

Data source

Public DNS records

Data from public DNS records.

Use it

Your AI assistant does the work: it finds this tool, shows you the price first, runs it, and you are charged when the run finishes. There is nothing to set up for this tool in particular.

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For developers: the calls your assistant makes

agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "omnial/x402-email-deliverability-check" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "omnial/x402-email-deliverability-check" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "omnial/x402-email-deliverability-check", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "omnial/x402-email-deliverability-check", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

Not connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.

Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0811

Updated: Oct 27, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string"
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "properties": {
    "spf": {
      "type": "object",
      "properties": {
        "valid": {
          "type": "boolean"
        },
        "exists": {
          "type": "boolean"
        },
        "record": {
          "type": "string",
          "description": "The raw SPF DNS TXT record."
        },
        "mechanism": {
          "type": "string",
          "description": "Human-readable summary of the record's terminal mechanism, e.g. '~all (soft fail)', '-all (hard fail)'."
        }
      },
      "additionalProperties": true
    },
    "dkim": {
      "type": "object",
      "properties": {
        "detected": {
          "type": "boolean"
        },
        "selector_found": {
          "type": [
            "string",
            "null"
          ],
          "description": "The DKIM selector found, or null when no DKIM record was detected."
        }
      },
      "additionalProperties": true
    },
    "dmarc": {
      "type": "object",
      "properties": {
        "exists": {
          "type": "boolean"
        },
        "policy": {
          "type": "string",
          "description": "e.g. 'reject'."
        },
        "record": {
          "type": "string",
          "description": "The raw DMARC DNS TXT record, published by the domain owner for anyone to query over DNS. May embed a `rua=mailto:` reporting address that the domain owner chose to publish publicly for aggregate-report delivery."
        }
      },
      "additionalProperties": true
    },
    "grade": {
      "type": "string",
      "description": "Letter grade derived from score. Observed: 'A', 'B'."
    },
    "score": {
      "type": "number",
      "description": "0-100 deliverability score. Observed: 80, 100."
    },
    "domain": {
      "type": "string",
      "description": "The domain that was checked."
    },
    "issues": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Plain-language problems found. Empty when the domain has no issues (observed on a fully-configured domain)."
    },
    "mx_records": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "exchange": {
            "type": "string"
          },
          "priority": {
            "type": "number"
          }
        },
        "additionalProperties": true
      },
      "description": "The domain's mail exchange records. A domain may show a single real MX host, or a single entry with an empty exchange string and priority 0 for a domain with no real mail server -- an empty `exchange` does not mean the array itself is empty."
    },
    "blacklisted": {
      "type": "boolean",
      "description": "True if the domain appears on any checked blacklist."
    },
    "recommendations": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Plain-language fixes for each issue. Empty when `issues` is empty."
    },
    "blacklists_checked": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string"
          },
          "listed": {
            "type": "boolean"
          }
        },
        "additionalProperties": true
      },
      "description": "3 entries on both real calls observed (zen.spamhaus.org, bl.spamcop.net, b.barracudacentral.org)."
    }
  },
  "description": "The deliverability report.",
  "additionalProperties": false
}