Invalid SPF Record
An invalid SPF record causes email authentication failures, leading to messages being rejected or marked as spam. SPF (Sender Policy Framework) uses DNS TXT records to specify which mail servers are authorized to send email for a domain. Common issues include exceeding the 10 DNS lookup limit, syntax errors, missing "v=spf1" prefix, and overly permissive policies.
Symptoms
- Emails going to spam or being rejected by recipients
- SPF authentication showing "permerror" or "temperror" in email headers
- Bounce messages citing SPF policy violations
- DMARC reports showing high SPF failure rates
Common Causes
- Exceeding the 10 DNS lookup limit (includes, a, mx, redirect mechanisms)
- Syntax errors in the SPF record (wrong format, typos)
- Multiple SPF records published (only one is allowed)
- Missing mechanisms for legitimate sending services
- Using +all (pass all) instead of ~all or -all
Step-by-Step Troubleshooting
- 1
Validate SPF record
Check the SPF record for syntax errors, lookup count, and policy configuration.
Use SPF Checker → - 2
Check TXT records
Verify there is exactly one SPF record in your DNS TXT records.
Use TXT Record Lookup → - 3
Flatten SPF if over limit
Use SPF flattening to replace include mechanisms with direct IP addresses, reducing DNS lookups.
Use SPF Flattener → - 4
Generate a new SPF record
Use the SPF generator to create a properly formatted record with all your sending services.
Use SPF Generator → - 5
Verify DMARC alignment
Ensure DMARC policy is configured to work with your corrected SPF record.
Use DMARC Check →
Recommended Diagnostic Tools
Monitor Email Authentication
Get alerts when SPF, DKIM, or DMARC records change or break.