# ATK Email Authentication Security Checker

> ATK Email Authentication Security Checker is a paid API for AI agents from atkvn.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Analyzes a domain's email authentication configuration (DMARC, MTA-STS, SPF, etc.) and returns a security grade with actionable remediation items

## Facts

- Endpoint: GET https://atkvn.com/agent/v1/email-auth?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/atk-email-authentication-security-checker-70ef08b0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zBO3rt3yTXoydzOxzwy06

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability atk-email-authentication-security-checker-70ef08b0
```

Example prompt: Can you run an email authentication audit on example.com and tell me what security grade it gets and what I need to fix?

## When to prefer this

Use this endpoint when you need a quick, structured email security assessment for any domain — especially when you want a graded report with explicit remediation steps. Prefer this over raw DNS lookups when you need a human-readable grade and consolidated view of DMARC, MTA-STS, and SPF posture in one call. Ideal for due diligence, compliance audits, or pre-deployment verification of email infrastructure.

## Known failure modes

- Domain does not exist or has no DNS records — may return empty or error response
- Domain parameter missing from query — schema validation failure
- DNS lookup timeout for domains with slow resolvers
- Domains with no DMARC record may return minimal results
- Rate limiting or payment failure for high-volume usage

## How this service works

Grade a domain's email authentication A-F: SPF (lookup count, all-qualifier, duplicates), DMARC policy and reporting, MTA-STS mode, BIMI. Use before sending campaigns or to assess spoofing risk of a vendor's domain.

## Output

A JSON object containing a letter security grade (e.g. 'B'), the domain analyzed, the DMARC policy in effect, and a 'todo' array listing specific remediation recommendations such as missing MTA-STS configuration or policy weaknesses.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "e.g. example.com"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "todo": [
   "No MTA-STS ..."
  ],
  "dmarc": {
   "policy": "quarantine"
  },
  "grade": "B",
  "domain": "example.com"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/atk-email-authentication-security-checker-70ef08b0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from atkvn.com](https://www.zero.xyz/host/atkvn.com/llms.txt)