SPF Validator

Check and analyze SPF records for email authentication.

Enter Domain

Enter a domain name to validate its SPF record and check for common issues.

About SPF Records

SPF (Sender Policy Framework) is an email authentication method designed to detect forged sender addresses during the delivery of email. SPF allows the receiver to check that an email claiming to come from a specific domain is submitted by an IP address authorized by that domain's administrators.

Why SPF Matters

Prevents email spoofing and phishing attacks
Improves email deliverability by reducing the chance of legitimate emails being marked as spam
Protects your domain's reputation
Works alongside DKIM and DMARC for comprehensive email authentication

Common SPF Issues

Too many DNS lookups: SPF has a limit of 10 DNS lookups per record
Missing "all" mechanism: Without an "all" mechanism, unauthorized senders aren't explicitly denied
Overly permissive policy: Using "+all" allows anyone to send email from your domain
Duplicate or conflicting records: Multiple SPF records can cause validation failures

Example SPF Record

v=spf1 include:_spf.google.com include:sendgrid.net ip4:192.0.2.0/24 -all

This example authorizes Google's mail servers, SendGrid, and a specific IP range to send email from your domain, while explicitly denying all other senders.