DMARC Validation Skill

Overview

A DMARC record lookup API. This tool queries DNS records to inspect and validate the DMARC record associated with a domain. It analyzes policy strength, formatting and alignment modes, derives whether the domain actively enforces DMARC and a composite email-spoofing risk score, and provides guidance for better email deliverability and protection against spoofing.

Live Test DMARC Validation Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as DMARCValidationSkill. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

{
  "name": "DMARCValidationSkill",
  "arguments": {
    "domain": "paypal.com"
  }
}

You do not name the tool yourself; the model picks it. Asking about paypal.com in the terms this skill covers is enough for it to reach for DMARCValidationSkill on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

https://api.vervekit.com/v1/mcp

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

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{
  "status": "ok",
  "error": null,
  "data": {
    "host": "paypal.com",
    "dmarcHost": "_dmarc.paypal.com",
    "hasDmarc": true,
    "dmarc_record": "v=DMARC1; p=reject; rua=mailto:[email protected],mailto:[email protected]; ruf=mailto:[email protected],mailto:[email protected]",
    "rua": {
      "email": "[email protected],[email protected]",
      "domain": "rua.agari.com",
      "valid": true
    },
    "ruf": {
      "email": "[email protected],[email protected]",
      "domain": "ruf.agari.com",
      "valid": true
    },
    "v": "DMARC1",
    "p": "reject",
    "sp": null,
    "pct": null,
    "adkim": null,
    "aspf": null,
    "fo": null,
    "rf": null,
    "ri": null,
    "valid": true,
    "issues": [],
    "isEnforced": true,
    "riskScore": 5,
    "riskLevel": "low"
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

A call costs 10 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Vendor Security Audits

Audit partner domains during vendor reviews by inspecting their published DMARC policy and flagging entries set to none instead of reject.

Outbound Campaign Verification

Before sending mass marketing broadcasts, deliverability platforms verify sender domains to confirm that DMARC records exist and specify strict alignment modes.

Inbound Mail Protection

To stop spoofed sender addresses, secure email gateways evaluate incoming message domains against live DMARC policies and quarantine suspicious traffic.

Domain Portfolio Health

DNS administrators track customer domains across registrars to detect misconfigured report addresses, missing subdomain policies, and unaddressed syntax issues.

Other ways to use DMARC Validation Skill

Set up DMARC Validation Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

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