Loading Empire…

Skip to content

Learn Fix Tools

Search/

Appearance

Filter problems…

SPF Problems
DKIM Problems
DMARC Problems
DNS & Infrastructure Problems
Delivery Problems
Inbox Placement Problems
Provider Problems
Reputation Problems
Campaign Performance Problems
- High unsubscribe rate
- Low open rate
Warmup Problems

Home
Fix
SPF Problems
Invalid SPF mechanism

Invalid SPF mechanism

SPF record contains unsupported or malformed mechanisms.

Reading time:: 5 min
Difficulty:: Intermediate
Estimated duration:: 5 min
Prerequisites:: None
Last updated:: 2026-07-15
Author:: empire

Problem summary

SPF record contains unsupported or malformed mechanisms.

Severity: High

Symptoms

Parsers reject the SPF string
Unknown or malformed mechanisms in the TXT
permerror tied to syntax rather than lookup count

Possible causes

Typos (e.g. inlclude, missing :, stray quotes)
Non-SPF text concatenated into the same TXT
Deprecated or invented mechanisms

How to diagnose

Compare the live TXT byte-for-byte to a known-good draft
Validate with an SPF syntax checker
Ensure only SPF content is in that TXT value

How to fix

Rewrite to valid mechanisms (example shape): v=spf1 ip4:192.0.2.0/24 include:esp.example.com ~all
Split unrelated TXT (verification tokens) into separate records
Republish and flush editor/UI auto-formatting issues (smart quotes)

How to verify

Syntax validators accept the record
Evaluation returns pass/fail/softfail — not permerror from parse

Prevention

Edit SPF in plain text; avoid rich-text DNS UIs when possible
Peer-review SPF changes before publish

When to escalate

Production mail is failing for a material share of recipients after remediation attempts

SPF mechanismsMatch rules in an SPF policy such as ip4, include, and mx.

Broken SPF includeAn included SPF domain is missing, invalid, or fails closed.
Forwarded email fails SPFForwarding paths break SPF because the forwarder is not authorized.
Incorrect IP authorizationSending infrastructure IPs are not authorized by SPF.
Multiple SPF recordsMore than one SPF TXT record exists, causing evaluation failure.
SPF passes but DMARC failsSPF authenticates a domain that does not align for DMARC.
SPF PermErrorSPF evaluation fails permanently due to policy or lookup errors.
SPF record missingNo SPF TXT record is published for the sending domain.
SPF TempErrorTemporary DNS or evaluation failure during SPF checks.
Too many DNS lookupsSPF evaluation exceeds the ten-lookup limit.

digCLI DNS lookup utility for authoritative and recursive inspection of mail-related records.
MXToolboxPopular DNS and mail diagnostics suite for SPF, DMARC, blacklist, and MX checks.
Mail-TesterSend-a-message spam and authentication scoring for pre-send QA.
Kitterman SPF validatorClassic web SPF policy evaluator used by operators for syntax checks.

PreviousIncorrect IP authorization NextMultiple SPF records

Company

About
Contact
Services

Platform

Learn
Fix
Tools

Community

Empire is a living operator community — share practice, follow releases, and help shape the knowledge base.

Newsletter — coming soon

Legal

Privacy Policy
Terms of Use
Disclaimer
Editorial Policy
Cookie Policy

© 2026 Empire Email

Independent educational platform focused on email infrastructure, deliverability, and lifecycle marketing.