---
title: "Troubleshooting SPF syntax errors: Tips for fixing the most common mistakes | DuoCircle"
description: "Troubleshooting SPF syntax errors: Tips for fixing the most common mistakes."
image: "https://www.duocircle.com/images/og-default.png"
canonical: "https://www.duocircle.com/blog/email-security/troubleshooting-spf-syntax-errors-tips-for-fixing-the-most-common-mistakes/"
---

Quick Answer

A single character wrong in an SPF record can cause every message to fail authentication, so syntax matters as much as the IPs you list. The most common mistakes: omitting the v=spf1 prefix (the only version tag a record can use), mixing up mechanisms like ip4, ip6, a, mx, and include or missing colons, exceeding the 10-DNS-lookup limit (which produces a permerror), publishing two TXT records for spf1 on the same domain (only one is allowed), and ending without an all qualifier such as \~all or -all. Every authorized sender must be listed explicitly or via include, and changes must propagate through DNS before checks pass. Validate records with an SPF checker before publishing and watch DMARC reports for spf=fail results that flag drift.

Troubleshooting SPF syntax errors: Tips for fixing the most common mistakes

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![Troubleshooting SPF syntax errors](https://media.mailhop.org/duocircle/images/2025/10/spf-validator-5601.jpg) 

When you configure SPF for your domain, there are a lot of things that can go wrong and wreck your entire setup. And if your SPF configuration is not done right, your emails will be at risk, the risk of being rejected, marked as spam, or worse, being impersonated by [threat actors](https://www.infosecurity-magazine.com/news/arcanedoor-attacks-against-cisco/). 

That’s why even a minor syntax error in your SPF record can be really problematic for your **domain’s email deliverability** and your organization’s [security posture](https://www.techtarget.com/searchsecurity/definition/security-posture). 

So, it’s important that you are mindful of these [syntax errors](https://www.geeksforgeeks.org/c/what-is-a-syntax-error-and-how-to-solve-it/) and know exactly how to catch and correct them before they cause any damage. 

We get it, setting up an SPF record might seem simple on the surface, but **every minute detail matters**, and if done incorrectly, it can leave your domain vulnerable. This is why, in this article, we will learn about common SPF syntax mistakes and how to fix them.

[![how to fix them](https://media.mailhop.org/duocircle/images/2025/10/spf-record-5577.jpg)](https://media.mailhop.org/duocircle/images/2025/10/spf-record-5577.jpg)

## Why does SPF syntax matter?

When you configure an [SPF record](/resources/spf-records), you don’t just list all the sending servers in one place; you do it in a way that the receiving servers understand. If there is the slightest discrepancy in the record or you miswrite even one part, like missing a space, using the wrong mechanism, or putting things in the wrong order, the entire record can fail.

_And when that happens, it doesn’t matter if your list of servers is otherwise correct; the SPF check will fail altogether_. What this essentially means is that your emails could get rejected or sent straight to the [spam folder](/announcements/cyber-security-news-update-week-40-of-2025/). Or even worse, your domain would become susceptible to spoofing, because you’ve essentially lost **one layer of defense**. That’s why every part of the syntax matters, and getting it wrong can break your [email authentication](/resources/email-authentication) without you even realizing it.

## What are common SPF syntax errors, and how can you fix them?

We now know that even the slightest mistakes in your SPF record can throw off your entire setup, but what are those errors? **How can you fix them**? Let’s take a look:

[![what are those errors](https://media.mailhop.org/duocircle/images/2025/10/spf-record-check-5577.jpg)](https://media.mailhop.org/duocircle/images/2025/10/spf-record-check-5577.jpg)

### Missing ‘v=spf1’

One of the prerequisites of a valid SPF record is that it **should start with “v=spf1**”. In the record, “v” is the version tag, and SPF1 is the version number. Since there is only one version available at present, it is non-negotiable that you must include it in your SPF record. 

Here’s what your SPF record looks like if you skip it: 

- ‘include:\_spf.yourdomain.com \~all’

A valid record should look something like this:

- ‘v=spf1 include:\_spf.yourdomain.com \~all’

### Wrong syntax mechanism

_The syntax mechanism in your SPF record tells the receiving email servers which sources are authorized to send emails on your behalf_. You can use mechanisms like “**ip4”, “ip6”, “a”, “mx”, and “include**” to define these sources. Each of them serves a different purpose, but if you mix them up, you miss necessary colons or prefixes, or misspell them, your SPF record won’t function as it is supposed to.

[![ email servers](https://media.mailhop.org/duocircle/images/2025/10/sender-policy-framework-5577.jpg)](https://media.mailhop.org/duocircle/images/2025/10/sender-policy-framework-5577.jpg)

To fix this, make sure that you’re carefully reviewing the syntax of each mechanism in your SPF record, double-check for typos, missing colons, or misplaced spaces. You can also validate your record using SPF checking tools that will highlight any mistakes before you **publish the record**. 

### Missing Spaces

This is another common mistake that most people make while creating their record. Each **mechanism and modifier** in the SPF record should be separated by a single space. _If you forget to add a space between mechanisms, the receiving server won’t be able to parse the record correctly, and it might treat the entire record as invalid_.

Your record should look like “v=spf1 include:\_spf.yourdomain.com \~all” and not like “v=spf1include:\_spf[.yourdomain.com](http://.yourdomain.com)\~all”

[![SPF Record Spacing Mistakes](https://media.mailhop.org/duocircle/images/2025/10/windows-smtp-service-8902.jpg)](https://media.mailhop.org/duocircle/images/2025/10/windows-smtp-service-8902.jpg)

### Incorrect qualifiers

_A qualifier in SPF is a symbol that tells email servers what to do when a sender isn’t on your approved list_. But if you use the wrong qualifier, that is, “+all” or “?all” instead of “-all” or “\~all”, you’re basically allowing anyone to **send emails from your domain**. This leaves your domain wide open to spoofing. 

To stay protected, always end your SPF record with “-all” to reject unauthorized senders or “\~all” to flag them as suspicious.

### Too many DNS lookups

SPF records have a limit of 10 DNS lookups. If your record exceeds this, the SPF check automatically fails, even if the rest of the record is correct. This usually happens when you use various **third-party services** that send emails on your behalf. But there’s a way to resolve this. 

Make sure to use the ‘**include’ mechanisms carefully**; only add the services you actually use to send emails or use a [SPF flattening tool](https://autospf.com/blog/free-spf-flattening-tool-download-best-software/).

Are you also struggling to maintain your SPF record? [Reach out](https://autospf.com/contact-us/) to [DuoCircle](/) and we can help you audit, **optimize, and fix your SPF setup** so your domain stays secure and your emails land where they should.

## Topics

SecurityspfSPF record 

![Brad Slavin](https://media.mailhop.org/dmarcreport/images/team/brad-slavin.jpg) 

Brad Slavin 

General Manager

General Manager at DuoCircle. Product strategy and commercial lead across the email security portfolio.

## Secure your email infrastructure

Protect, authenticate, and deliver. Contact our team to find the right solution.

[Contact Sales](/contact/) [Explore Products](/products/) 

## Related Articles

[  Email Security 6m  Building a zero-trust security model for emails  Dec 11, 2024 ](/blog/email-security/building-a-zero-trust-security-model-for-emails/)[  Email Security 4m  SPF records updated by Google: Here’s what domain owners need to know!  Dec 10, 2025 ](/blog/email-security/google-updates-spf-records-what-domain-owners-should-know/)[  Email Security 7m  How email authentication helps you prove sender identity under ISO 27001  Nov 18, 2025 ](/blog/email-security/how-email-authentication-helps-verify-sender-identity-for-iso-27001/)[  Email Security 6m  How do you achieve SPF alignment to enhance email security and deliverability?  Mar 25, 2025 ](/blog/email-security/how-spf-alignment-improves-email-security-and-deliverability/)

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