The Sender Policy Framework (SPF) is an email security mechanism. Typically, online services offer SPF URLs to simplify system configuration. The table below groups the most popular online services. For more information on SPF configuration, see the ultimate guide article How to configure a secure email system to protect deliverability and prevent identity spoofing.
| Company / Service | SPF |
| Google (Gmail, G Suite, Workspace) | _spf.google.com |
| Microsoft (Outlook, Office 365) | spf.protection.outlook.com |
| SendGrid | sendgrid.net |
| Mailgun | mailgun.org |
| Brevo | spf.brevo.com |
| Amazon SES | amazonses.com |
| GoDaddy | secureserver.net |
| Salesforce | _spf.salesforce.com |
| MailJet | spf.mailjet.com |
| MailChimp | servers.mcsv.net |
| OVH | mx.ovh.com |
| Zendesk | mail.zendesk.com |
| Zoho | zoho.com |
| HubSpot | spf.hubspotemail.net |
| Sendinblue | spf.sendinblue.com |
| Constant Contact | ccsend.com |
| AWeber | send.aweber.com |
| Marketo | spf.mktomail.com |
| Campaign Monitor | cmail1.com |
| Yahoo | _spf.mail.yahoo.com |
| Apple (iCloud) | spf.mail.me.com |
| ProtonMail | _spf.protonmail.ch |
How to configure a secure email system to protect deliverability and prevent identity spoofing