DIAGNOSTIC ERROR

SPF PermError (Permanent Error)

The definitive diagnostic guide to SPF validation failures that instantly reject your emails.

Are your emails bouncing with a PermError? Jump straight to our free diagnostic tool to find the exact cause, or read below to learn how to fix it.

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What is an SPF PermError?

According to RFC 7208, a PermError (Permanent Error) is returned when the SPF evaluation fails because the DNS record cannot be correctly interpreted. Unlike a TempError (caused by transient network issues), a PermError requires explicit administrative action to resolve.

Common Causes of SPF PermError

An SPF PermError can be caused by various misconfigurations. Check your DNS records for the following common offenses:

Multiple SPF Records
Having more than one TXT record in your DNS that begins with v=spf1 immediately throws an SPF PermError. See our Multiple SPF Records Guide for merging instructions.
Exceeding the 10-Lookup Limit
To prevent Denial of Service attacks, the email standard tightly caps the maximum number of DNS lookups to 10 per SPF evaluation. Mechanisms like include, a, mx, and ptr trigger lookups. Once crossing this limit, mail servers stop evaluating and return a PermError.
Invalid Syntax
Using unrecognized mechanisms, typographical errors (like inlcude: instead of include:), missing spaces between tags, or using spaces where they don't belong (e.g., ip4: 192.0.2.0).
Void Lookups Limit Exceeded
If a DNS lookup (like an include) returns no answers or a "NXDOMAIN" response, it counts as a "void lookup". Having more than two void lookups within an SPF check can trigger a PermError.
Deprecated Mechanisms
Using deprecated mechanisms such as ptr (which has been explicitly deprecated by RFC 7208 due to performance issues) can prompt restrictive mail filters to throw an error.

Critical Warning: A PermError is a fatal break in your email security posture. Submitting emails with a PermError means receivers will treat them as indistinguishable from spoofed spam, heavily impacting your deliverability to Gmail, Yahoo, and Microsoft 365.

A Robust Repair Strategy: Subdomain Delegation

If fixing your SPF PermError involves untangling too many required third-party services (which push you over the lookup limits), consider migrating non-essential mail (like marketing blasts or automated system alerts) to a subdomain.

For example, instead of sending Mailchimp campaigns from yourdomain.com, send them from notify.yourdomain.com. SPF policies are evaluated at the exact domain level sending the email. By moving high-volume third-party services strictly to a subdomain, you unlock a fresh, independent 10-lookup limit and TXT record specifically dedicated to that subdomain—preserving your primary domain strictly for your core communication tools, like Microsoft 365.

Additional SPF Support Resources

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