DIAGNOSTIC PLAYBOOK
SPF TempError: investigate a temporary DNS failure
An SPF TempError means evaluation could not finish because of a temporary problem, often a DNS lookup failure. It does not establish that the sender is unauthorized, and changing the authorization policy may leave the actual fault untouched.
HealthCheck Email editorial team · · Examples are illustrative
How to investigate
- Capture the receiving server's result, the envelope sender and the source IP from the affected message.
- Resolve the SPF TXT record and each dependency, looking for timeouts or SERVFAIL at the recorded time.
- Repeat from another resolver and check the authoritative service. Verify a fresh message after DNS recovery.
What this looks like
ILLUSTRATIVE EXAMPLE
A provider include times out while the root TXT record answers normally. The top-level SPF string has not changed, but the dependent lookup prevents a complete result.
A mistake to avoid
Do not replace a temporary error with an allow-all policy. Fix the failing dependency and retain the evidence in case the problem recurs.
Keep the result in context
SPF evaluates the SMTP client against the envelope sender domain, or the HELO identity in the applicable case. A record lookup can identify publication problems; a message result also needs the actual sending IP and identity. Keep those inputs with your investigation.
Take the next step
Use the related check to gather evidence, then compare it with the affected message or service. Keep the result and time with your notes so a later change can be distinguished from the original problem.
Sources and further reading
The protocol references below explain the underlying behavior. Your sending or DNS provider supplies the account-specific settings for its service.