Gmail temporary SPF policy error
Fix Gmail 451 4.7.24 suspicious SPF rate limiting
Gmail uses 451 4.7.24 when it considers one or more SPF entries suspicious and temporarily rate limits mail from the IP. Check current policy structure and sender ownership before removing anything.
Gmail reports:
451 4.7.24 The SPF record of the sending domain has one or more suspicious entries.
Check the current SPF configuration
451 is temporary and should be retried with backoff. A persistent suspicious policy still deserves a controlled correction.
Review safely
- Multiple SPF policies or malformed terms.
- Broken include/redirect dependencies.
- Obsolete, overly broad, or unreachable authorizations.
- Unexpected MAIL FROM domain selected by the sender.
Resolution sequence
- Inventory every legitimate sender.
- Inspect the exact MAIL FROM domain's selected policy.
- Follow only reachable dependencies.
- Correct the smallest confirmed defect without weakening enforcement.
- Send a fresh test after DNS is visible.
Frequently asked questions
What does Gmail 451 4.7.24 mean?
Gmail considers one or more SPF entries suspicious and temporarily rate limits mail from the sending IP.
Should I delete an SPF include immediately?
No. First confirm whether the service is a legitimate sender and whether the term is reachable.
Can MailFixIt reproduce Gmail's rate limit?
No. It can identify relevant current SPF defects, but Gmail controls receiver policy and rate limiting.
Related email diagnostics
Primary sources: Gmail SMTP errors and codes and RFC 7208 SPF.