While SPF is a powerful tool, it does have some limitations:
- Forwarding Issues: SPF can fail when emails are forwarded because the forwarding server’s IP address may not be listed in the original sender’s SPF record. - Complex Management: Managing SPF records can become complex, especially for large organizations with multiple sending servers. - Limited Scope: SPF only verifies the envelope sender (MAIL FROM), not the header sender (From:), which can still be spoofed.