{
 "measuredAt": "2026-08-19",
 "sampleFrame": "Fortune 50 by 2025 revenue \u2014 the same 50 apex domains as hireamino.com/research/fortune-50",
 "method": {
  "engine": "hireamino.com/spf (amino-monitor src/engine.js countSpfLookups)",
  "resolver": "Cloudflare DNS-over-HTTPS (1.1.1.1), serialised, retried on SERVFAIL",
  "counts": "RFC 7208 \u00a74.6.4 DNS-lookup mechanisms: include, a, mx, ptr, exists, redirect. ip4/ip6/all cost nothing.",
  "classification": "A record whose apex contains an SPF macro (%{...}) is classed 'macro' and is NOT assigned a lookup count: the hostname is only formed at delivery time from the sending IP, so no tool can resolve it statically. Correction: an earlier cut of this dataset classified only the domains whose walk errored, which missed seven macro domains whose macro include still counted as one lookup without erroring. The macro count is 25, not 18.",
  "limitations": [
   "Apex domains only. A subdomain used for bulk sending can have a different record.",
   "Macro detection is on the apex record. A macro nested inside an include: target was not exhaustively checked across all 50.",
   "Counts are a point-in-time snapshot. Providers change their records without notice."
  ]
 },
 "summary": {
  "domains": 50,
  "withSpf": 50,
  "macroBased": 25,
  "macroByVendor": {
   "Proofpoint": 18,
   "Cisco": 2,
   "self-hosted or other": 1,
   "Agari": 1,
   "Valimail": 3
  },
  "staticallyCounted": 25,
  "overLimit": 0,
  "atOrAbove8": 2,
  "min": 1,
  "max": 9,
  "median": 4,
  "mean": 3.84,
  "histogram": {
   "1": 5,
   "2": 5,
   "3": 1,
   "4": 3,
   "5": 6,
   "6": 2,
   "7": 1,
   "8": 1,
   "9": 1
  }
 },
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   "hasSpf": true,
   "class": "counted",
   "lookups": 4,
   "macroVendor": null,
   "macroMechanism": null,
   "record": "v=spf1 include:spf1.amazon.com include:spf2.amazon.com include:amazonses.com -all"
  },
  {
   "domain": "apple.com",
   "hasSpf": true,
   "class": "counted",
   "lookups": 2,
   "macroVendor": null,
   "macroMechanism": null,
   "record": "v=spf1 include:_spf.apple.com include:_spf-txn.apple.com ~all"
  },
  {
   "domain": "att.com",
   "hasSpf": true,
   "class": "macro",
   "lookups": null,
   "macroVendor": "Proofpoint",
   "macroMechanism": "%{ir}.%{v}.%{d}.spf.has.pphosted.com",
   "record": "v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all"
  },
  {
   "domain": "bankofamerica.com",
   "hasSpf": true,
   "class": "counted",
   "lookups": 1,
   "macroVendor": null,
   "macroMechanism": null,
   "record": "v=spf1 ip4:171.161.41.178 ip4:171.159.227.167 ip4:171.161.147.155 include:spf-0000ec15.pphosted.com ~all"
  },
  {
   "domain": "berkshirehathaway.com",
   "hasSpf": true,
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   "macroMechanism": null,
   "record": "v=spf1 include:spf.protection.outlook.com -all"
  },
  {
   "domain": "boeing.com",
   "hasSpf": true,
   "class": "counted",
   "lookups": 2,
   "macroVendor": null,
   "macroMechanism": null,
   "record": "v=spf1 include:_spf.boeing.com include:spf-000f9d01.pphosted.com -all"
  },
  {
   "domain": "cardinalhealth.com",
   "hasSpf": true,
   "class": "macro",
   "lookups": null,
   "macroVendor": "Cisco",
   "macroMechanism": "%{i}.spf.hc2781-64.iphmx.com",
   "record": "v=spf1 exists:%{i}.spf.hc2781-64.iphmx.com include:_spf.salesforce.com include:spf-a.opntxtdns.com include:7698986.spf08.hubspotemail.net include:sendgrid.net include:amazonses.com ip4:12.19.100.11 ip4:208.185.229.41 ip4:208.185.229.42 ip4:208.185.229.43 ip4:208.185.229.44 ip4:208.185.229.45 ip4:72.3.202.3 ip4:198.89.160.32 ip4:198.89.160.35 ip4:199.230.252.125 ip4:199.230.252.126 ip4:199.230.200.212 ip4:199.230.200.213 ~all"
  },
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   "hasSpf": true,
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   "macroVendor": "Proofpoint",
   "macroMechanism": "%{ir}.%{v}.%{d}.spf.has.pphosted.com",
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   "macroVendor": "self-hosted or other",
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   "macroVendor": "Proofpoint",
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   "macroVendor": "Agari",
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  },
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  {
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   "macroVendor": "Proofpoint",
   "macroMechanism": "%{ir}.%{v}.%{d}.spf.has.pphosted.com",
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  {
   "domain": "exxonmobil.com",
   "hasSpf": true,
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   "record": "v=spf1 include:spf-00016304.pphosted.com include:spf-00016305.pphosted.com ip4:158.26.24.0/28 -all"
  },
  {
   "domain": "fanniemae.com",
   "hasSpf": true,
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   "macroVendor": "Valimail",
   "macroMechanism": "%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email",
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  },
  {
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   "macroVendor": "Proofpoint",
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   "record": "v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com a:smtp-out-colo.dmz.fedex.com  -all"
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   "domain": "ford.com",
   "hasSpf": true,
   "class": "macro",
   "lookups": null,
   "macroVendor": "Proofpoint",
   "macroMechanism": "%{ir}.%{v}.%{d}.spf.has.pphosted.com",
   "record": "v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com include:_spf.azell.com ~all"
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   "macroVendor": "Proofpoint",
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   "record": "v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com include:mailgun.org ~all"
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  {
   "domain": "gm.com",
   "hasSpf": true,
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   "record": "v=spf1 mx include:_spf-a.gm.com include:_spf-b.gm.com include:_spf.google.com ~all"
  },
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   "domain": "goldmansachs.com",
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   "class": "counted",
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   "record": "v=spf1 a mx include:_spf.gs.com ~all"
  },
  {
   "domain": "google.com",
   "hasSpf": true,
   "class": "counted",
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   "macroVendor": null,
   "macroMechanism": null,
   "record": "v=spf1 include:_spf.google.com ~all"
  },
  {
   "domain": "homedepot.com",
   "hasSpf": true,
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   "macroVendor": "Proofpoint",
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   "macroVendor": "Proofpoint",
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   "hasSpf": true,
   "class": "counted",
   "lookups": 1,
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   "macroMechanism": null,
   "record": "v=spf1 a:spf.jpmchase.com ip4:207.162.228.0/24 ip4:207.162.229.0/24 ip4:207.162.225.0/24 ip4:196.37.232.50 ip4:159.53.46.0/24 ip4:159.53.36.0/24 ip4:159.53.110.0/24 ip4:170.148.48.0/24 ip4:159.53.78.0/24 -all"
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  {
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   "hasSpf": true,
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   "record": "v=spf1 include:spf.kroger.com -all"
  },
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   "record": "v=spf1 include:_spf.salesforce.com include:servers.mcsv.net include:_spf1.mckesson.com include:_spf2.mckesson.com include:spf.bananatag.com -all"
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   "macroVendor": null,
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   "record": "v=spf1 redirect=_spf.fb.com"
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   "record": "v=spf1 include:_spf-a.microsoft.com include:_spf-b.microsoft.com include:_spf-c.microsoft.com include:_spf-ssg-a.msft.net include:_spf1-meo.microsoft.com -all"
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  {
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   "lookups": 1,
   "macroVendor": null,
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   "record": "v=spf1 include:spf-00104b02.pphosted.com ip4:206.80.140.0/28 ip4:206.80.141.0/28 ~all"
  },
  {
   "domain": "stonex.com",
   "hasSpf": true,
   "class": "macro",
   "lookups": null,
   "macroVendor": "Proofpoint",
   "macroMechanism": "%{ir}.%{v}.%{d}.spf.has.pphosted.com",
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   "macroVendor": "Proofpoint",
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   "hasSpf": true,
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   "macroVendor": null,
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   "record": "v=spf1 include:res.cisco.com include:_spfv4.corpmailsvcs.com -all"
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   "macroMechanism": null,
   "record": "v=spf1 include:verizonwireless.com ~all"
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  {
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   "hasSpf": true,
   "class": "macro",
   "lookups": null,
   "macroVendor": "Proofpoint",
   "macroMechanism": "%{ir}.%{v}.%{d}.spf.has.pphosted.com",
   "record": "v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com include:_netblocks.walmart.com include:_vspf1.walmart.com include:_vspf2.walmart.com include:_vspf3.walmart.com ip4:161.170.248.0/24 ip4:161.170.244.0/24 ip4:161.170.241.16/30 ip4:161.170.245.0/24 ip4:161.170.249.0/24 ~all"
  },
  {
   "domain": "wellsfargo.com",
   "hasSpf": true,
   "class": "macro",
   "lookups": null,
   "macroVendor": "Proofpoint",
   "macroMechanism": "%{ir}.%{v}.%{d}.spf.has.pphosted.com",
   "record": "v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all"
  }
 ]
}