SPF TempError: What It Means and How to Fix It

If you have been looking at email headers and noticed spf=temperror in the authentication results, you are probably wondering what went wrong and whether your emails are at risk. The short answer is that a TempError is a temporary DNS hiccup during SPF evaluation, not a problem with your SPF record itself. But there are situations where it can become your problem.

This guide explains what SPF TempError means, what causes it, how it differs from a PermError, and when you should take action. For a broader look at SPF configuration, see our complete SPF guide.

What SPF TempError Means

When a receiving email server checks your SPF record per RFC 7208, it queries DNS to look up the TXT record for your domain. If that DNS query fails temporarily, the server cannot complete the SPF evaluation. Instead of returning a pass or fail, it returns a TempError.

In email headers, it looks something like this:

Authentication-Results: mx.receiver.com;
    spf=temperror (temporary DNS error evaluating sender@yourdomain.com)

The key word here is "temporary." The SPF record itself may be perfectly valid. The DNS lookup just could not complete at that specific moment.

TempError vs PermError

These two error types are easy to confuse because they both indicate an SPF failure, but they have very different causes and implications.

If you are seeing PermError instead of TempError, your SPF record has a structural problem that needs fixing. See our guide on SPF PermError for help diagnosing and resolving permanent error issues.

Common Causes of SPF TempError

DNS server timeout

The most common cause. The receiving server tried to look up your SPF record, but your DNS provider did not respond fast enough. This can happen during high-traffic periods, DNS provider outages, or general internet routing issues.

Network connectivity issues

Sometimes the path between the receiving mail server and your DNS provider experiences temporary network problems. Packet loss, routing changes, or congestion can all cause DNS queries to fail without it being anyone's specific fault.

DNS rate limiting

Some DNS providers impose rate limits on how many queries they will answer in a given time period. If your domain receives a large volume of email and many receiving servers query your DNS simultaneously, some queries may be rate-limited and return errors.

Recursive resolver problems

The receiving server's own DNS resolver might be experiencing issues. If their local resolver is overloaded or misconfigured, it might fail to resolve your SPF record even though your DNS is functioning normally.

How Receiving Servers Handle TempError

Most email servers are designed to handle temporary DNS failures gracefully. The typical behavior is:

• Retry later. Many servers queue the message and try SPF evaluation again after a short delay.
• Accept tentatively. Some servers accept the email but flag it with a lower trust score.
• Defer delivery. The server may send a temporary rejection (4xx response) asking the sending server to try again later.

In practice, a single TempError rarely causes an email to be permanently rejected or sent to spam. It becomes a problem only if the errors are persistent and repeated.

When TempError Is NOT Your Problem

Most of the time, TempError is out of your control. If the issue is on the receiving server's side — their DNS resolver is slow, their network has problems, or they are experiencing high load — there is nothing you can do from your end. The error will resolve when their infrastructure recovers.

You can confirm this by checking your own SPF record. If it loads correctly in the checker below, your DNS is working fine and the issue was on the other end.

When TempError IS Your Problem

There are situations where persistent TempErrors point to an issue you can and should fix.

Unreliable DNS hosting

If your DNS provider has frequent outages or slow response times, receiving servers will regularly fail to look up your SPF record. This creates repeated TempErrors that can hurt your deliverability over time. Consider switching to a more reliable DNS provider if you see a pattern.

DNS misconfiguration

If your domain's nameservers are misconfigured — for example, pointing to servers that do not actually host your zone — every DNS query will fail. This looks like a TempError to receiving servers but is actually a configuration problem on your end.

Overly complex SPF records

SPF records with many nested include mechanisms require multiple DNS queries to evaluate. The more queries involved, the higher the chance that one of them times out. While this does not cause TempError directly, it increases the probability. If your record is complex, consider simplifying it through SPF flattening or other techniques covered in our guide on the SPF 10 DNS lookup limit.

Third-party DNS issues

If one of the domains in your include: mechanisms has DNS problems, it can cause a TempError during SPF evaluation of your record. For example, if your record includes include:thirdparty.com and thirdparty.com's DNS is down, receiving servers may return a TempError for your domain's SPF check.

What to Do About Persistent TempErrors

If you are seeing TempErrors repeatedly:

1. Check your SPF record using the tool above to confirm it is valid and properly published.
2. Test your DNS response times. Slow DNS responses increase the chance of timeouts.
3. Review your DNS provider's uptime. Check their status page for known issues.
4. Simplify your SPF record. Fewer DNS lookups means fewer chances for timeout.
5. Check third-party includes. Verify that the domains in your include mechanisms have functioning DNS.

Complete Your Email Authentication

If you are investigating TempErrors, it is worth checking your entire email authentication setup. SPF works alongside DKIM and DMARC to protect your domain.

• DKIM (RFC 6376) provides a cryptographic signature that verifies email integrity, and it does not depend on DNS lookups at send time. Verify your DKIM setup with DKIM Test.
• DMARC (RFC 7489) ties SPF and DKIM together and provides reporting so you can see authentication results across all your email. Check your DMARC record with DMARC Record Checker.

Having all three configured means that even if SPF experiences a temporary DNS failure, DKIM can still authenticate the message and DMARC alignment can pass.

References

• RFC 7208: Sender Policy Framework (SPF) — The current SPF specification, including TempError handling
• RFC 6376: DomainKeys Identified Mail (DKIM) — DKIM specification
• RFC 7489: Domain-based Message Authentication, Reporting, and Conformance (DMARC) — DMARC specification