Email Authentication API

Example Request

curl -H "X-API-Key: $DOMSCAN_API_KEY" "https://domscan.net/v1/email-auth?domain=example.com&selectors=google%2Cselector1%2Csendgrid"

Example Response

{
  "domain": "google.com",
  "spf": {
    "record": "v=spf1 include:_spf.google.com ~all",
    "lookup_estimate": 1,
    "includes": [
      "_spf.google.com"
    ],
    "redirect": null,
    "macros_present": false,
    "macro_references": [],
    "lookup_walk_count": 1,
    "lookup_limit_exceeded": false,
    "walk": [
      {
        "domain": "google.com",
        "depth": 0,
        "record": "v=spf1 include:_spf.google.com ~all",
        "mechanisms": [
          "include:_spf.google.com",
          "~all"
        ],
        "includes": [
          "_spf.google.com"
        ],
        "redirect": null,
        "direct_lookup_count": 1,
        "total_lookup_count": 1,
        "macros_present": false,
        "macro_references": [],
        "multiple_records": 1
      }
    ],
    "walk_errors": [],
    "lookup_tree": {
      "root_domain": "google.com",
      "node_count": 1,
      "max_depth": 0,
      "cycles_detected": [],
      "nodes": [
        {
          "domain": "google.com",
          "depth": 0,
          "status": "present",
          "direct_lookup_count": 1,
          "total_lookup_count": 1,
          "includes": [
            "_spf.google.com"
          ],
          "redirect": null,
          "mechanisms": [
            "include:_spf.google.com",
            "~all"
          ],
          "errors": []
        }
      ],
      "edges": [
        {
          "from": "google.com",
          "to": "_spf.google.com",
          "type": "include"
        }
      ]
    }
  },
  "dkim": [
    {
      "selector": "google",
      "record": "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A",
      "key_type": "rsa",
      "key_size": 2048
    }
  ],
  "dkim_audit": {
    "selectors_checked": [
      "google",
      "default",
      "selector1",
      "selector2"
    ],
    "selectors_found": [
      {
        "selector": "google",
        "dns_name": "google._domainkey.google.com",
        "record": "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A",
        "record_type": "TXT",
        "cname_targets": [],
        "provider_hint": "Google Workspace",
        "key_type": "rsa",
        "key_size": 2048,
        "valid": true,
        "revoked": false,
        "weak": false,
        "hash_algorithms": [
          "sha256"
        ],
        "service_type": "email",
        "flags": [
          "s"
        ],
        "issues": []
      }
    ],
    "total_found": 1,
    "providers_detected": [
      "Google Workspace"
    ],
    "valid_selector_count": 1,
    "weak_selector_count": 0,
    "revoked_selector_count": 0
  },
  "bimi": {
    "exists": true,
    "record": "v=BIMI1; l=https://example.com/logo.svg; a=https://example.com/vmc.pem",
    "valid": true,
    "logo_url": "https://example.com/logo.svg",
    "authority_url": "https://example.com/vmc.pem",
    "logo_fetch_ok": true,
    "logo_http_status": 200,
    "logo_content_type": "image/svg+xml",
    "logo_bytes": 2048,
    "logo_svg_detected": true,
    "vmc_present": true,
    "vmc_fetched": true,
    "vmc_http_status": 200,
    "vmc_content_type": "application/x-pem-file",
    "vmc_certificate_valid": true,
    "vmc_subject": "/CN=Example Inc VMC",
    "vmc_issuer": "/CN=Example Issuer",
    "vmc_not_before": "2026-01-01T00:00:00Z",
    "vmc_not_after": "2027-01-01T00:00:00Z",
    "vmc_days_to_expiry": 258,
    "vmc_fingerprint_sha256": "AA:BB:CC:DD",
    "vmc_san_domains": [
      "google.com"
    ],
    "errors": []
  },
  "dmarc": {
    "record": "v=DMARC1; p=reject; rua=mailto:[email protected]",
    "tags": {
      "v": "DMARC1",
      "p": "reject",
      "rua": "mailto:[email protected]"
    }
  },
  "mta_sts": {
    "exists": true,
    "record": "v=STSv1; id=2024010101Z",
    "valid": true,
    "policy_id": "2024010101Z",
    "policy_fetch_ok": true,
    "policy_http_status": 200,
    "mode": "enforce",
    "max_age": 86400,
    "mx_hosts": [
      "*.google.com"
    ],
    "mx_records": [
      "aspmx.l.google.com"
    ],
    "policy_matches_mx": true,
    "uncovered_mx": [],
    "errors": []
  },
  "tls_rpt": {
    "exists": true,
    "record": "v=TLSRPTv1; rua=mailto:[email protected]",
    "valid": true,
    "rua": [
      "mailto:[email protected]"
    ],
    "errors": []
  },
  "client_access": {
    "provider_hint": {
      "id": "google_workspace",
      "name": "Google Workspace"
    },
    "mx_records": [
      "aspmx.l.google.com"
    ],
    "services": [
      {
        "service": "imap",
        "host": "imap.gmail.com",
        "port": 993,
        "source": "provider_default",
        "priority": null,
        "weight": null,
        "tls_mode": "implicit",
        "reachable": true,
        "tls_negotiated": true,
        "starttls_offered": null,
        "protocol": "TLSv1.3",
        "cipher": "TLS_AES_256_GCM_SHA384",
        "certificate": {
          "subject": "/CN=imap.gmail.com",
          "issuer": "/CN=WR2",
          "not_before": "2026-01-01T00:00:00Z",
          "not_after": "2026-07-01T00:00:00Z",
          "days_to_expiry": 70,
          "expired": false,
          "san_domains": [
            "imap.gmail.com"
          ],
          "public_key_type": "EC",
          "public_key_bits": 256,
          "fingerprint_sha256": "CC:DD:EE:FF",
          "hostname_match": true,
          "chain_valid": true,
          "chain_error": null
        },
        "chain_depth": 2,
        "error": null
      }
    ],
    "reachable_service_count": 1,
    "secure_service_count": 1
  },
  "autodiscover": {
    "provider_hint": {
      "id": "google_workspace",
      "name": "Google Workspace"
    },
    "mx_records": [
      "aspmx.l.google.com"
    ],
    "srv": {
      "autodiscover": [],
      "submission": [],
      "submissions": [],
      "imap": [],
      "imaps": [],
      "pop3": [],
      "pop3s": []
    },
    "thunderbird_autoconfig": {
      "subdomain": {
        "url": "https://autoconfig.google.com/mail/config-v1.1.xml?emailaddress=postmaster%40google.com",
        "status_code": 404,
        "content_type": "text/html",
        "final_url": "https://autoconfig.google.com/mail/config-v1.1.xml?emailaddress=postmaster%40google.com",
        "redirect_count": 0,
        "incoming": [],
        "outgoing": [],
        "error": null
      },
      "well_known": {
        "url": "https://google.com/.well-known/autoconfig/mail/config-v1.1.xml?emailaddress=postmaster%40google.com",
        "status_code": 200,
        "content_type": "application/xml",
        "final_url": "https://google.com/.well-known/autoconfig/mail/config-v1.1.xml?emailaddress=postmaster%40google.com",
        "redirect_count": 0,
        "incoming": [
          {
            "type": "imap",
            "hostname": "imap.gmail.com",
            "port": 993,
            "socket_type": "SSL"
          }
        ],
        "outgoing": [
          {
            "type": "smtp",
            "hostname": "smtp.gmail.com",
            "port": 587,
            "socket_type": "STARTTLS"
          }
        ],
        "error": null
      }
    },
    "outlook_autodiscover": {
      "url": "https://autodiscover.google.com/autodiscover/autodiscover.xml",
      "status_code": 401,
      "content_type": "text/html",
      "final_url": "https://autodiscover.google.com/autodiscover/autodiscover.xml",
      "redirect_count": 0,
      "auth_required": true,
      "error": null
    },
    "recommended": [
      {
        "service": "imap",
        "host": "imap.gmail.com",
        "port": 993,
        "tls_mode": "implicit",
        "source": "provider_default"
      }
    ]
  },
  "edge_summary": {
    "relay_configured": true,
    "evidence_sources": [
      "spf_walk",
      "mail_policies",
      "bimi_audit",
      "dkim_audit",
      "mail_client_access",
      "mail_autodiscover"
    ],
    "spf_lookup_count": 1,
    "spf_lookup_limit_exceeded": false,
    "dkim_valid_selector_count": 1,
    "dkim_weak_selector_count": 0,
    "dkim_revoked_selector_count": 0,
    "providers_detected": [
      "Google Workspace"
    ],
    "mta_sts_enforced": true,
    "tls_rpt_configured": true,
    "bimi_logo_verified": true,
    "vmc_certificate_valid": true,
    "client_access_reachable_services": 1,
    "client_access_secure_services": 1,
    "autodiscover_recommendation_count": 1
  },
  "provider_selector_recommendations": [
    {
      "provider": "Google Workspace",
      "selectors": [
        "google",
        "20230601",
        "20210112"
      ],
      "source": "detected",
      "checked_selectors": [
        "google"
      ],
      "found_selectors": [
        "google"
      ],
      "missing_selectors": [
        "20230601",
        "20210112"
      ]
    }
  ],
  "grade": "A",
  "notes": []
}