NetIntel Email Auth Checker

x402

NetIntel Email Auth Checker is a paid API for AI agents from netintel-production-440c.up.railway.app, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-12).

Validates SPF, DKIM, and DMARC records for a domain, probes multiple DKIM selectors concurrently, detects misconfigurations, and returns an overall email security grade (A–F) with transparent deductions.

Price / call$0.03

Seller volume →—

Success—

StatusUnknown

How this service works

Network intelligence API — 142 endpoints, all pay-per-call via x402 micropayments (USDC on Base or Solana mainnet). NetIntel is agent fair-trade aligned: transparent per-call pricing in USDC on Base or Solana via x402, no API keys or signup, and automatic no-charge on server errors, upstream failures, and input-validation rejections — failed calls are never billed across NetIntel's network, domain, and data-intelligence endpoints.

Output

Returns a structured object with SPF record details and issues, DKIM records per selector with key type and length, DMARC policy details including rua/ruf URIs and pct, per-issue severity and score deductions, and an overall email security letter grade (A–F).

Example use cases

Pre-send deliverability audit

“Before we launch this email campaign, can you run a full email security audit on our domain marketingco.io — check SPF, DKIM, and DMARC, probe selectors like 'sendgrid', 'google', and 'default', and tell me if anything could hurt our deliverability or get us flagged as spam?”

Vendor domain trust check

“We're about to onboard a new supplier and they'll be sending us invoices via email from invoices.suppliergroup.com — can you audit their email authentication setup, check their DMARC policy, and give me a security grade so I know if we should trust emails claiming to be from them?”

Phishing vulnerability detection report

“I need to know if any of our subsidiary domains are vulnerable to email spoofing — start with brandX.com, check its SPF, DKIM selectors including 'mail', 'smtp', and 'default', and DMARC configuration, then flag any misconfigurations that could let someone impersonate us in a phishing attack?”

Technical details

Endpoint

POSThttps://netintel-production-440c.up.railway.app/email-auth?utm_source=zero.xyz

When to prefer

Use this endpoint when you need a comprehensive, graded email authentication audit for a single domain covering SPF, DKIM, and DMARC in one call, especially when you want to probe multiple DKIM selectors concurrently and receive transparent scoring deductions. Prefer this over manual DNS lookups when you need actionable misconfiguration detection and a summary grade suitable for reporting or policy enforcement.

Side effects

Domain does not exist or cannot be resolved — DNS lookup fails
No DKIM record found for any of the provided selectors — DKIM flagged as not found
DMARC record missing or malformed — issues listed with deductions
SPF record exceeds 10 DNS lookup limit — flagged as misconfiguration
Invalid domain input format — request rejected
Network timeout during concurrent DNS probes

Input

{
  "domain": "example.com",
  "dkim_selectors": [
    "google",
    "default",
    "mail"
  ]
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "spf": {
    "found": true,
    "issues": [],
    "record": "v=spf1 -all",
    "mechanisms": [],
    "all_qualifier": "-all",
    "dns_lookup_count": 0
  },
  "dkim": {
    "found": false,
    "issues": [
      {
        "message": "No DKIM record found for any selector",
        "severity": "fail",
        "deduction": -20
      }
    ],
    "records": [
      {
        "issues": [
          {
            "message": "Key revoked (empty p= tag)",
            "severity": "info",
            "deduction": 0
          }
        ],
        "record": "v=DKIM1; p=",
        "key_type": "rsa",
        "selector": "google",
        "key_length_bits": null
      },
      {
        "issues": [
          {
            "message": "Key revoked (empty p= tag)",
            "severity": "info",
            "deduction": 0
          }
        ],
        "record": "v=DKIM1; p=",
        "key_type": "rsa",
        "selector": "default",
        "key_length_bits": null
      },
      {
        "issues": [
          {
            "message": "Key revoked (empty p= tag)",
            "severity": "info",
            "deduction": 0
          }
        ],
        "record": "v=DKIM1; p=",
        "key_type": "rsa",
        "selector": "mail",
        "key_length_bits": null
      }
    ],
    "selectors_checked": [
      "google",
      "default",
      "mail"
    ]
  },
  "dmarc": {
    "pct": 100,
    "rua": [],
    "ruf": [],
    "found": true,
    "issues": [
      {
        "message": "No aggregate report URI (rua) configured",
        "severity": "warn",
        "deduction": -5
      },
      {
        "message": "No forensic report URI (ruf) configured",
        "severity": "info",
        "deduction": -3
      }
    ],
    "policy": "reject",
    "record": "v=DMARC1;p=reject;sp=reject;adkim=s;aspf=s",
    "subdomain_policy": "reject"
  },
  "grade": "C",
  "score": 72,
  "domain": "example.com",
  "deductions": [
    {
      "rule": "dkim_none_found",
      "detail": "No DKIM record found for any selector",
      "points": -20
    },
    {
      "rule": "dmarc_no_rua",
      "detail": "No aggregate report URI (rua) configured",
      "points": -5
    },
    {
      "rule": "dmarc_no_ruf",
      "detail": "No forensic report URI (ruf) configured",
      "points": -3
    }
  ]
}

Schema · Response

{
  "type": "json",
  "example": {
    "spf": {
      "found": true,
      "issues": [],
      "record": "v=spf1 include:_spf.google.com -all",
      "mechanisms": [
        "include:_spf.google.com"
      ],
      "all_qualifier": "-all",
      "dns_lookup_count": 1
    },
    "dkim": {
      "found": true,
      "issues": [],
      "records": [
        {
          "issues": [],
          "record": "v=DKIM1; k=rsa; p=MIIBIjAN...",
          "key_type": "rsa",
          "selector": "google",
          "key_length_bits": 2048
        }
      ],
      "selectors_checked": [
        "default",
        "google"
      ]
    },
    "dmarc": {
      "pct": 100,
      "rua": [
        "mailto:dmarc@example.com"
      ],
      "ruf": [
        "mailto:forensic@example.com"
      ],
      "found": true,
      "issues": [],
      "policy": "reject",
      "record": "v=DMARC1; p=reject; rua=mailto:dmarc@example.com; ruf=mailto:forensic@example.com",
      "subdomain_policy": null
    },
    "grade": "A",
    "score": 100,
    "domain": "example.com",
    "resolves": true,
    "deductions": []
  }
}

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