---
title: "What is an SPF Record Flattener and Why Should you Consider Using it for Your Domain? | AutoSPF"
description: "If your domain is already protected with the Sender Policy Framework (SPF) and you regularly update and monitor your SPF records."
image: "https://autospf.com/og/blog/spf-record-flattener-why-should-consider-using-for-your-domain.png"
canonical: "https://autospf.com/blog/spf-record-flattener-why-should-consider-using-for-your-domain/"
---

Quick Answer

Well, an SPF record flattener can be your savior. An SPF record flattener is a tool that simplifies and optimizes SPF records by consolidating multiple SPF records or compressing all domains within the SPF, ultimately eliminating the need for additional DNS lookups. An SPF flattener typically works like this-

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![What is an SPF Record](https://media.mailhop.org/autospf/images/2024/04/spf-lookup-9715.jpg) 

If your domain is already protected with the [Sender Policy Framework](/blog/what-is-spf-email-a-guide-to-sender-validation-technology/) (SPF) and you regularly update and monitor your SPF records, then we are sure you must be aware of the [SPF lookup limit](/blog/why-sender-policy-framework-spf-has-a-lookup-limit-of-10/). But do you know how to get rid of this problem and stay within the lookup limit to avoid invalidation of your record or occurrences of false positives? 

> “The misconception about SPF flattening is that it’s a one-time fix,” says Adam Lundrigan, CTO of DuoCircle and architect of AutoSPF’s flattening engine. “Vendor IP ranges change constantly - Google rotated their \_netblocks three times in 2025 alone. A flattened record that isn’t automatically re-resolved goes stale and silently de-authorizes legitimate senders. That’s why AutoSPF re-scans every 15 minutes.”

> “The 10-lookup limit is the single most common reason enterprise SPF records silently break,” says Brad Slavin, General Manager of DuoCircle and founder of AutoSPF. “In our experience managing SPF for 2,000+ customer domains, the failure mode is always the same: a team adds a new SaaS tool, its include pushes the total past 10, and legitimate email starts failing - but nobody notices until a customer complains about missing invoices or password resets.”

_Per [RFC 7208](https://datatracker.ietf.org/doc/html/rfc7208), SPF evaluation is capped at 10 DNS mechanism lookups and 2 void lookups per check - exceeding either limit produces a `PermError` that fails authentication for every message from the domain._

Well, an [SPF record flattener](/) can be your savior. 

## What is an SPF Record Flattener and How Does it Work?

_An SPF record flattener is a tool that simplifies and optimizes SPF records by consolidating [multiple SPF records](/spf-too-many-dns-lookups/multiple-spf-records/) or compressing all domains within the SPF, ultimately eliminating the need for additional DNS lookups._ An SPF flattener typically works like this-

### Input

The SPF record flattener takes the existing SPF records associated with a domain as input. These records may be defined in [DNS TXT records](https://www.cloudflare.com/learning/dns/dns-records/dns-txt-record/) or other SPF-related configurations.

### Analysis

The SPF flattener checks the submitted SPF record for overlapping or [redundant mechanisms](https://www.catchpoint.com/blog/dns-redundancy), modifiers, or include statements. _It examines all SPF mechanisms and modifiers present_.

### Consolidation

After the analysis, the tool consolidates several SPF records into a single one. _It combines redundant mechanisms and modifiers from all the input records, resolving conflicts to develop a more concise and result-driving [SPF record](/explaining-sender-policy-framework-spf-macros/spf-record-syntax/)._

### Optimization

The SPF record flattener may optimize the resulting SPF record by reordering mechanisms and modifiers to adhere to [SPF’s best practices](/blog/spf-best-practices-cisos-guide-to-email-security/) and guidelines. This optimization ensures that the SPF record is structured in a way that maximizes compatibility and effectiveness.

### Output

You receive a new SPF TXT record that includes all the required mechanisms and modifiers without redundancies and inconsistencies, which ultimately eliminates the need for [multiple DNS lookups](https://www.digicert.com/faq/dns/how-does-dns-lookup-work).

### Updating DNS Records

![domain's DNS records](https://media.mailhop.org/autospf/images/2024/04/spf-record-checker-9712.jpg) 

Finally, the SPF record flattener updates the [domain’s DNS records](https://www.domain.com/help/article/what-is-dns-record) to replace the existing SPF records with the new, flattened SPF record. This ensures that email servers and [anti-spam systems](https://en.wikipedia.org/wiki/Anti-spam%5Ftechniques) correctly interpret and enforce the domain’s [SPF policy](/generative-ai-and-phishing-threats/spf-record-breakdown/).

## Compelling Reasons to Use an SPF Record Flattener

_SPF record flattening makes it easier to manage and update SPF, reducing the risk of [lookup failures](https://www.forbes.com/advisor/business/what-is-dns-failure/#:~:text=A%20DNS%20failure%20occurs%20when,getting%20back%20a%20busy%20signal.) due to hitting the limit of 10_. Apart from this, here are some more reasons for you to consider the tool-

### Staying Within the Lookup Limit

_As mentioned above, SPF has a lookup limit of 10 to avoid [DNS query](https://docs.digitalocean.com/glossary/dns-query/) overhead, network latency, resource consumption, complexity, and [DDoS attacks](https://ipi.media/new-surge-of-ddos-attacks-threatens-media-freedom-in-europe/)_. This limit is a headache for companies, especially the ones having multiple IP addresses and domains associated with email delivery. By using an SPF record flattener, the need for multiple lookups fades away, and you stay within the limit.

### Staying Within the Character Limit

DNS has imposed a character limit of 255 to keep the DNS querying process fast and efficient. This prevents [DNS packet fragmentation](https://blog.apnic.net/2022/09/21/ip-fragmentation-and-the-dns-the-state-of-ip-fragmentation/), which introduces complexity and raises potential [security vulnerabilities](https://portswigger.net/daily-swig/dozens-of-web-apps-vulnerable-to-dns-cache-poisoning-via-forgot-password-feature).

_If your SPF record has redundant mechanisms and modifiers, it’s highly likely to exceed the limit of 255 characters, resulting in [DNS errors](https://www.atera.com/blog/what-is-dns-error-all-about-common-dns-errors-and-how-to-fix-them/) and invalidation of the SPF record_. But if you decide to use an SPF record flattener, your record will get shorter and fall within the limit, saving you from all the goof-ups and hard work in fixing them.

### Improved Email Deliverability

Email servers find it difficult and resource-consuming to interpret complex or [nested SPF TXT records](https://www.courier.com/guides/multiple-spf-records/). SPF flattening resolves this by streamlining the submitted SPF record, uncomplicating the task of interpreting what’s directed in your record. This reduces the instances of [email abuse](https://www.livemint.com/technology/tech-news/google-gmail-wants-to-reduce-spam-emails-in-your-inbox-from-april-onwards-heres-how-11707724127755.html) and false negatives. 

### Reduced Risk of Misconfigurations

It’s a no-brainer to understand that if your domain has multiple SPF records, you will face [misconfiguration issues](https://www.bleepingcomputer.com/news/technology/square-last-weeks-outage-was-caused-by-dns-issue-not-a-cyberattack/#google%5Fvignette) due to redundancies and inconsistencies. _And not to forget the crisis that comes with conflicting rules and omitted senders_.

_Compressed outputs from SPF flatteners are consistent, streamlined, and convey the same rules for recipients’ servers_. So, email servers will treat illegitimate and legitimate emails from your domain just as you want them to!

### Overall Consistency

Maintaining consistency across multiple SPF records is challenging due to the potential for different instructions and mechanisms. This variation causes validation problems, like [false positives](https://www.institutedata.com/blog/what-is-a-false-positive-in-cybersecurity/). 

SPF record flattening resolves this by consolidating multiple records into one, ensuring consistent instructions for recipients’ mailboxes, and eliminating the need to update multiple records.

## How Can We Help?

We at AutoSPF go by just one belief that more DNS lookups equals more problems, and no one likes problems, right?

![email deliverability](https://media.mailhop.org/autospf/images/2024/04/spf-record-syntax-8423.jpg) 

So, we have solutions for enterprises and SMBs. We take care of [email deliverability](/spf-validation-failed-meaning-and-troubleshooting-methods/spf-validation-error/), domain reputation, [sender reputation](https://bird.com/guides/email-sender-reputation), and much more so that you take care of the rest of the operations.

And you know what gives us self-validation? Our guarantee to fix your broken record within 60 seconds..!! If we fail, your first 12 months are on us. So, want to [get started](/book-a-demo/)? Or do you still want to gain some more clarity? Whatever you decide, we are here to help. [Contact us](/contact-us/) whenever you feel right.

## Topics

[ email security ](/tags/email-security/)[ SPF Flattening ](/tags/spf-flattening/)[ SPF Flattening tool ](/tags/spf-flattening-tool/)[ SPF record ](/tags/spf-record/) 

![Adam Lundrigan](https://media.mailhop.org/autospf/images/authors/adam-lundrigan.jpg) 

[ Adam Lundrigan ](/authors/adam-lundrigan/) 

CTO

CTO of DuoCircle. Architect of AutoSPF's SPF flattening engine and DNS monitoring infrastructure.

[LinkedIn Profile →](https://www.linkedin.com/in/adamlundrigan/) 

## Ready to get started?

Try AutoSPF free — no credit card required.

[ Book a Demo ](/book-a-demo/) 

## Related Articles

[  Advanced 6m  Does SPF play a significant role in BIMI and VMC?  Apr 30, 2025 ](/blog/does-spf-play-a-significant-role-in-bimi-and-vmc/)[  Advanced 4m  How do cybercriminals use neglected domains to evade SPF and DMARC protections?  Jul 30, 2025 ](/blog/how-cybercriminals-use-neglected-domains-evade-spf-dmarc-protection/)[  Advanced 7m  SPF Best Practices for Protection Against Email Spoofing and Phishing; A Guide for CISOs  Mar 15, 2024 ](/blog/spf-best-practices-cisos-guide-to-email-security/)[  Advanced 30m  Best SPF Management Tools for MSPs in 2026 A Buyer’s Guide  Apr 27, 2026 ](/blog/best-spf-management-tools-for-msps-in-2026-buyers-guide/)

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