{
 "measured_on": "2026-09-13",
 "method": "recursive RFC 7208 lookup count via aureliussdr.com resolver; cost = 1 (the include) + lookups triggered inside it",
 "rows": [
  {
   "name": "Freshdesk",
   "include": "spf.freshdesk.com",
   "lookups": 8,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 include:sendgrid.net include:mailgun.org ~all"
  },
  {
   "name": "Stripe",
   "include": "stripe.com",
   "lookups": 8,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:198.2.180.60/32 ip4:13.111.2.227/32 include:spf1.stripe.com include:greenhouse-outbound-mail.stripe.com include:_spf.qualtrics.com ~all"
  },
  {
   "name": "Mailgun",
   "include": "mailgun.org",
   "lookups": 5,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 include:_spf.mailgun.org include:_spf.eu.mailgun.org -all"
  },
  {
   "name": "Zoho Mail",
   "include": "zoho.com",
   "lookups": 5,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 include:spf.zoho.com include:zcsend.net include:spf.zohomail.com include:popspf.zohomail.com -all"
  },
  {
   "name": "GoDaddy / Secureserver",
   "include": "secureserver.net",
   "lookups": 3,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 include:spf-0.secureserver.net -all"
  },
  {
   "name": "Hostinger",
   "include": "_spf.mail.hostinger.com",
   "lookups": 3,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 include:relay.mail.hostinger.com include:relay.mailchannels.net ~all"
  },
  {
   "name": "HubSpot",
   "include": "_spf.hubspot.com",
   "lookups": 3,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 ip4:54.174.63.0/24 ip4:54.174.52.0/24 ip4:52.40.63.40 ip4:52.40.63.41 ip4:52.40.63.42 ip4:52.88.240.251 ip4:52.40.63.27 ip4:52.40.63.5 ip4:52.40.63.29 include:sendgrid.net -all"
  },
  {
   "name": "OVH",
   "include": "mx.ovh.com",
   "lookups": 3,
   "overflow": false,
   "all": "?all",
   "record": "v=spf1 ptr:mail-out.ovh.net ptr:mail.ovh.net ip4:8.33.137.105/32 ip4:192.99.77.81/32 ?all"
  },
  {
   "name": "Atlassian (Jira/Confluence)",
   "include": "_spf.atlassian.net",
   "lookups": 2,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 ip4:167.89.0.0/17 ip4:168.245.0.0/17 include:amazonses.com -all"
  },
  {
   "name": "Elastic Email",
   "include": "_spf.elasticemail.com",
   "lookups": 2,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 exists:%{i}._spf.elasticemail.info ~all"
  },
  {
   "name": "ProtonMail",
   "include": "_spf.protonmail.ch",
   "lookups": 2,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:185.70.40.0/24 ip4:185.70.41.0/24 ip4:185.70.43.0/24 ip4:79.135.106.0/24 ip4:79.135.107.0/24 ip4:109.224.244.0/24 include:_spf2.protonmail.ch ~all"
  },
  {
   "name": "Salesforce",
   "include": "_spf.salesforce.com",
   "lookups": 2,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 exists:%{i}._spf.mta.salesforce.com -all"
  },
  {
   "name": "SendGrid (Twilio)",
   "include": "sendgrid.net",
   "lookups": 2,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:167.89.0.0/17 ip4:208.117.48.0/20 ip4:50.31.32.0/19 ip4:198.37.144.0/20 ip4:198.21.0.0/21 ip4:192.254.112.0/20 ip4:168.245.0.0/17 ip4:149.72.0.0/16 ip4:159.183.0.0/16 ip4:134.128.64.0/18 ip4:159.26.176.0/20 include:ab.sendgrid.net ~all"
  },
  {
   "name": "SMTP.com",
   "include": "spf.smtp.com",
   "lookups": 2,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:192.40.160.0/19 ip4:74.91.80.0/20 include:mktomail.com ~all"
  },
  {
   "name": "SparkPost",
   "include": "sparkpostmail.com",
   "lookups": 2,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 exists:%{i}._spf.sparkpostmail.com ~all"
  },
  {
   "name": "ActiveCampaign",
   "include": "emsd1.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:173.236.20.0/24 ip4:192.92.97.0/24 ip4:52.128.40.0/21 ip4:217.8.118.0/24 ip4:103.229.233.0/24 ~all"
  },
  {
   "name": "Amazon SES",
   "include": "amazonses.com",
   "lookups": 1,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 ip4:199.255.192.0/22 ip4:199.127.232.0/22 ip4:54.240.0.0/18 ip4:69.169.224.0/20 ip4:23.249.208.0/20 ip4:23.251.224.0/19 ip4:76.223.176.0/20 ip4:54.240.64.0/18 ip4:76.223.128.0/19 ip4:216.221.160.0/19 ip4:206.55.144.0/20 ip4:24.110.64.0/18 ip4:98.77.0.0/16 -all"
  },
  {
   "name": "Brevo (Sendinblue)",
   "include": "spf.brevo.com",
   "lookups": 1,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 ip4:185.41.28.0/22 ip4:94.143.16.0/21 ip4:185.24.144.0/22 ip4:153.92.224.0/19 ip4:213.32.128.0/18 ip4:185.107.232.0/22 ip4:77.32.128.0/18 ip4:77.32.192.0/19 ip4:212.146.192.0/18 ip4:172.246.0.0/18 -all"
  },
  {
   "name": "Constant Contact",
   "include": "spf.constantcontact.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:208.75.120.0/22 ip4:205.207.104.0/22 ~all"
  },
  {
   "name": "Fastmail",
   "include": "spf.messagingengine.com",
   "lookups": 1,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 ip4:103.168.172.128/27 ip4:202.12.124.128/27 ip4:204.75.18.128/27 -all"
  },
  {
   "name": "Google Workspace / Gmail",
   "include": "_spf.google.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:74.125.0.0/16 ip4:209.85.128.0/17 ip6:2001:4860:4864::/56 ip6:2404:6800:4864::/56 ip6:2607:f8b0:4864::/56 ip6:2800:3f0:4864::/56 ip6:2a00:1450:4864::/56 ip6:2c0f:fb50:4864::/56 ~all"
  },
  {
   "name": "IONOS",
   "include": "_spf-eu.ionos.com",
   "lookups": 1,
   "overflow": false,
   "all": "?all",
   "record": "v=spf1 ip4:212.227.126.128/25 ip4:82.165.159.0/26 ip4:212.227.15.0/25 ip4:212.227.17.0/27 ip4:217.72.192.64/26 ip4:212.227.25.128/25 ip6:2001:8d8:5c2::/64 ip6:2001:8d8:5c5::/64 ?all"
  },
  {
   "name": "Mailchimp",
   "include": "servers.mcsv.net",
   "lookups": 1,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 ip4:205.201.128.0/20 ip4:198.2.128.0/18 ip4:148.105.0.0/16 -all"
  },
  {
   "name": "Mailersend",
   "include": "_spf.mailersend.net",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:212.11.79.0/24 ~all"
  },
  {
   "name": "Mailjet",
   "include": "spf.mailjet.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:87.253.232.0/21 ip4:185.189.236.0/22 ip4:185.211.120.0/22 ip4:185.250.236.0/22 ip4:45.14.148.0/22 ~all"
  },
  {
   "name": "Mandrill",
   "include": "spf.mandrillapp.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:198.2.128.0/24 ip4:198.2.132.0/22 ip4:198.2.136.0/23 ip4:198.2.145.0/24 ip4:198.2.186.0/23 ip4:205.201.131.0/24 ip4:205.201.134.128/25 ip4:205.201.136.0/23 ip4:205.201.139.0/24 ip4:198.2.177.0/24 ip4:198.2.178.0/23 ip4:198.2.180.0/24 ~all"
  },
  {
   "name": "Microsoft 365 / Exchange Online",
   "include": "spf.protection.outlook.com",
   "lookups": 1,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 ip4:40.92.0.0/15 ip4:40.107.0.0/16 ip4:52.100.0.0/15 ip4:52.102.0.0/16 ip4:52.103.0.0/17 ip4:104.47.0.0/17 ip6:2a01:111:f400::/48 ip6:2a01:111:f403::/49 ip6:2a01:111:f403:8000::/51 ip6:2a01:111:f403:c000::/51 ip6:2a01:111:f403:f000::/52 -all"
  },
  {
   "name": "Mimecast (EU)",
   "include": "eu._netblocks.mimecast.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:195.130.217.0/24 ip4:91.220.42.0/24 ip4:146.101.78.0/24 ip4:207.82.80.0/24 ip4:213.167.81.0/25 ip4:193.7.207.0/25 ip4:213.167.75.0/25 ip4:185.58.85.0/24 ip4:185.58.86.0/24 ip4:193.7.206.0/25 ip4:147.28.36.0/24 ip4:193.7.204.0/24 ip4:193.7.205.0/24 ip4:185.58.84.0/24 ip4:185.58.87.0/24 ~all"
  },
  {
   "name": "Mimecast (US)",
   "include": "us._netblocks.mimecast.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:207.211.31.0/25 ip4:205.139.110.0/24 ip4:216.205.24.0/24 ip4:170.10.129.0/24 ip4:63.128.21.0/24 ip4:170.10.133.0/24 ip4:185.58.84.93/32 ip4:207.211.41.113/32 ip4:207.211.30.64/26 ip4:207.211.30.128/25 ip4:216.145.221.0/24 ip4:170.10.128.0/24 ip4:170.10.132.56/29 ip4:170.10.132.64/29 ~all"
  },
  {
   "name": "Postmark",
   "include": "spf.mtasv.net",
   "lookups": 1,
   "overflow": false,
   "all": "-all",
   "record": "v=spf1 ip4:50.31.156.96/27 ip4:104.245.209.192/26 ip4:50.31.205.0/24 ip4:147.160.158.0/24 -all"
  },
  {
   "name": "SendPulse",
   "include": "mxsspf.sendpulse.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:213.109.76.0/23 ip4:195.191.65.0/24 ip4:91.239.43.0/24 ip4:78.41.200.0/24 ip4:5.104.224.0/24 ip4:5.104.225.0/24 ~all"
  },
  {
   "name": "Shopify",
   "include": "shops.shopify.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ~all"
  },
  {
   "name": "Zendesk",
   "include": "mail.zendesk.com",
   "lookups": 1,
   "overflow": false,
   "all": "~all",
   "record": "v=spf1 ip4:103.151.192.0/23 ip4:185.12.80.0/22 ip4:188.172.128.0/20 ip4:192.161.144.0/20 ip4:216.198.0.0/18 ~all"
  }
 ],
 "unresolved": [
  "_spf.klaviyo.com",
  "_spf.intercom.io",
  "_spf.frontapp.com",
  "spf.docusign.net",
  "_spf.outreach.io",
  "spf.salesloft.com",
  "_spf.apollo.io",
  "_spf.customeriomail.com",
  "spf.moosend.com",
  "spf.ppe-hosted.com",
  "spf.barracudanetworks.com"
 ],
 "verified_on": "2026-09-20"
}