Sender Policy Framework (SPF) is an email authentication protocol that helps prevent email spoofing by specifying which mail servers are authorized to send emails on behalf of your domain.

1. Generate your SPF record using this tool
2. Access your DNS management panel
3. Create a new TXT record
4. Set the host/name field to "@"
5. Paste your SPF record as the value
6. Set TTL to 3600 seconds
7. Save and wait for DNS propagation
8. Test your implementation

• Start with "~all" for testing
• Keep records under 255 characters
• Limit DNS lookups to 10 maximum
• Review and update regularly
• Use with DKIM and DMARC
• Test thoroughly before enforcing
• Monitor for delivery issues