SPF Authentication Failed - How to Fix It?

Are your emails landing in spam or getting rejected without explanation? If yes, there's a good chance you’re dealing with an SPF authentication failed error.

SPF (Sender Policy Framework) is an essential email authentication protocol. When it fails, the receiving server can’t confirm that the message is coming from an authorized source. As a result, your emails are flagged as suspicious or completely blocked—impacting your ability to reach customers, leads, or partners.

The SPF authentication faiiled error is common, especially when using multiple email tools or sending emails on behalf of your domain through third-party services. Misconfigured SPF records or missing entries are often the cause.

In this article, we’ll break down:

- Why SPF authentication fails

- Common SPF authentication failed errors and what they mean

- Specific cases like SPF failed in Gmail and Outlook

- How to fix and prevent these issues

If email deliverability matters to your business, fixing SPF failures should be a priority.

What Is SPF Failure?

SPF failure occurs when the receiving server can't verify that an email was sent from an authorized source listed in your domain’s SPF record. This triggers the SPF authentication failed error and signals the server that the message might be suspicious.

SPF relies on DNS records where you define which mail servers are allowed to send emails on behalf of your domain. If the sending server isn’t listed there, the SPF check fails.

When this happens, one or more of the following things can happen:

- The email may land in the recipient’s spam or junk folder

- The server may reject the email completely

- Your domain reputation can take a hit over time

- Your email campaigns might experience low open and engagement rates

Emails landing in spam can be because of several other reasons apart from SPF authentication failed error. Read this blog to understand why emails land in spam.

So, it is good to analyze every error in detail to ensure that you have a clear understanding of why SPF is failing.

Types of SPF Failures

SPF doesn’t just return a pass or fail. It uses several result codes to indicate how the recipient server should treat the email.

These outcomes are determined by the qualifiers in your SPF record:

+ (Pass)

- (Fail)

~ (Softfail)

? (Neutral)

Each one leads to a different result during SPF authentication.

Let’s break them down:

1. SPF None

The SPF None error means the domain has no SPF record published. The server couldn't find any policy to check the authenticity of the sender.

Impact:

The recipient server treats the message as unauthenticated. It may not block it but could mark it as suspicious or spam.

Example of this error:

No v=spf1 record in DNS at all.

2. SPF Neutral (?)

The SPF Neutral error indicates that the domain owner explicitly says they are not stating whether the sender is authorized.

Impact:

Recipient servers make their own decision. Usually treated the same as a Softfail or None.

Example SPF Record:
v=spf1 ip4:192.168.0.1 ?all

This tells receiving servers: "I’m not saying if this IP is good or bad."

3. SPF Softfail (~)

SPF Softfall is when the sender is probably not authorized. It's a warning, not a hard block.

Impact:

Email might still be accepted but marked as suspicious or tagged as spam.

Example SPF Record:
v=spf1 include:_spf.example.com ~all

If the sender’s IP isn’t covered by the include, the message softfails.

4. SPF Fail (-) / Hardfail

In case of a hard SPF fail, the sender is explicitly unauthorized. The SPF record says the email must be rejected.

Impact:

Most servers will block or reject the email outright.

Example SPF Record:

v=spf1 include:_spf.example.com -all

If the IP doesn’t match, the email fails SPF and should be rejected.

5. SPF Temperror

SPF Temperror is a temporary DNS error occurred while trying to retrieve or check the SPF record. It’s not the sender’s fault.

Impact:

Recipient servers may choose to defer the message or retry later. Some may treat it as a softfail.

Example scenario:

DNS server timeout or misconfigured DNS zone during lookup.

6. SPF Permerror

A permanent error occurred while parsing or evaluating the SPF record. This usually means your SPF record is invalid.

Impact:

SPF (Sender Policy Framework) fails completely. Recipient servers may treat this like a Hardfail.

Causes include:

- More than one SPF record

- Invalid syntax

- Too many DNS lookups (>10)

- Void lookups exceeding the limit

- Record length over limit

Now when you are aware of the types of SPF fails, let’s dig deeper to understand the errors and find fixes.

How To Fix Top SPF Authentication Failed Errors

Let’s look at some common errors you might encounter when the SPF fails. I have also listed the fixes for these errors:

1. No SPF Record in DNS

As we read in the previous section, SPF record not found is one of the basic SPF authentication failed errors you can encounter. This mainly happens when your domain doesn't have an SPF record set in the DNS and hence mail servers receiving your cold emails are unable to verify the sender’s legitimacy.

As a result the SPF fails, and your emails may get flagged as spoofed or unauthorized.

Fix:

Create and publish an SPF record in your domain’s DNS as a TXT record. Every domain provider - be it GoDaddy or Namecheap, provides DNS management settings. You just have to add a TXT record in your domain’s DNS settings. The overall procedure to add the record is quite simple and straightforward, but the location of the settings can change depending upon the provider’s user interface.

A SPF record will look like this:

v=spf1 include:yourprovider.com ~all

Alternatively, you can generate a SPF record.

Use a lookup tool (try this free SPF Lookup tool from Smartlead) to verify that your SPF record is visible and valid.

Read more on how to set up your SPF record.

2. Multiple SPF Records

SPF does not allow more than one record per domain.

If you create more than one SPF record—for example, one for Google Workspace and another for a marketing platform—email servers won’t be able to process them correctly. This leads to SPF failures, which can cause your emails to land in spam or get rejected entirely.

When a mail server checks your domain’s SPF record, it expects to find a single TXT record starting with v=spf1. If it finds more than one, it can’t decide which one to use, and the validation fails. This is known as a parsing error.

Example of an incorrect setup:

v=spf1 include:_spf.google.com ~all

v=spf1 include:mail.zendesk.com ~all

This is not valid. Both are separate SPF records.

Fix:

You need to merge all the entries into one single SPF record.

Here’s how:

- Use the include: mechanism to add external service providers (like Google, Zendesk, Mailchimp, etc.)

- Use ip4: (or ip6:) to list direct IP addresses that are authorized to send emails

- End the line with ~all or -all depending on your policy

Correct version:

v=spf1 include:_spf.google.com include:mail.zendesk.com ip4:192.0.2.1 ~all

This single SPF record authorizes:

- Google (via _spf.google.com)

- Zendesk (via mail.zendesk.com)

- A specific IP address (192.0.2.1)

3. Missing Sending IPs or Tools

When you use cold email tools, they usually send emails through their own servers or IP addresses. These tools don’t automatically get permission to send emails on behalf of your domain. If their sending infrastructure isn’t explicitly listed in your domain’s SPF record, any emails sent through them can fail SPF checks.

This results in poor deliverability, with messages ending up in spam folders or getting blocked entirely.

Fix:

Start by reviewing your cold email platform’s documentation or settings. Most tools will provide either:

- A domain to include in your SPF record (e.g., include:spf.provider.com)

- Or a list of IP addresses that need to be authorized (e.g., ip4:203.0.113.10)

Update your SPF record to include these values. This gives mail servers a clear signal that these platforms are allowed to send emails on your behalf.

Example SPF snippet:

v=spf1 include:spf.provider.com ~all

Don’t Forget Other Tools

It’s not just your cold email platform that needs to be included. Review all tools that send emails using your domain, including:

- CRM platforms that send transactional or follow-up emails

- Inbox warmers

- Email tracking and analytics tools

- Auto-reply or email handling services

Each of these may use different IPs or domains, and every one must be accounted for in your SPF record to avoid failures.

4. Exceeded 10 DNS Lookup Limit

SPF records have a strict limit: only 10 DNS lookups are allowed per check. This is part of the SPF specification and exists to prevent abuse and slowdowns during email authentication.

Each of the following adds to your lookup count:

- include: mechanisms (e.g., include:sendgrid.net)

- redirect=

- Any nested includes within those included domains

- a, mx, or ptr mechanisms that require DNS resolution

Even if your SPF record looks valid, going over 10 DNS lookups causes the SPF check to automatically fail.

This issue is common when:

- You use multiple email tools (CRM, marketing automation, cold outreach, support, etc.)

- Each tool adds an include: to your SPF record

- Some includes point to domains that themselves contain multiple other includes (nested lookups)

This means even 4–5 tools can push you over the 10-lookup limit.

Fix:

- Use SPF Flattening Tools

These tools resolve the includes to their underlying IP addresses and replace them in your SPF record. This reduces or eliminates DNS lookups.

Example tools: EasySPF, MXToolbox SPF Flattening, or your DNS provider’s built-in features.

- Remove Unused Services

Audit your SPF record and remove includes for platforms you no longer use. Every unnecessary include adds lookup weight.

- Prioritize Your Senders

If flattening isn’t an option, keep only the includes for services that handle the majority of your sending volume. You may need to move secondary tools to subdomains with their own SPF setup.

Alternatively, you can consider using secondary domains for your cold emails. This can help you manage SPF more efficiently. It keeps your primary domain’s SPF record lightweight and avoids hitting the 10-DNS lookup limit. This also prevents SPF failures from affecting your main email traffic.

5. Exceeded Void Lookup Limit (2)

When SPF processes your record, it performs DNS lookups for each include: or mechanism. Sometimes, a lookup points to a domain that doesn’t return any valid SPF data—this is called a void lookup.

Examples of void lookups:

- The domain no longer exists

- The domain exists but has no SPF record

- The SPF record is empty or invalid

SPF allows a maximum of 2 void lookups during validation. If your record triggers more than that, the entire SPF check fails, even if everything else is configured correctly.

Fix:

Use an SPF diagnostic or checker tool (like MXToolbox, DMARC Analyzer, or your DNS provider’s tool) to scan your current SPF setup. These tools will flag entries which include: entries are causing void lookups.

Once identified:

- Remove or replace the entries that no longer point to active services

- Check with your providers to ensure you’re using the correct include domains

- Avoid using outdated SPF includes from tools you no longer use or that have changed their infrastructure

6. Record Too Long or Broken by DNS

SPF TXT records must not exceed 255 characters in one string or 512 characters total. If too long, some DNS servers reject or misread them.

Fix:

Flatten your record and remove unnecessary or legacy entries. If your DNS host supports it, split the record into quoted strings (as permitted by RFC specs).

7. Syntax Errors

Typos, incorrect mechanisms, or invalid qualifiers can silently break your SPF record.

For example, using ip: instead of ip4:, or placing all before includes.

Fix:

Validate your record using a tool like EasyDMARC or SPF Surveyor. Follow correct syntax:

- v=spf1 must come first

- Use correct mechanisms like ip4:, ip6:, include:

- Only one all mechanism at the end

8. Misconfigured Subdomain or Mailbox

If you send cold emails from a subdomain (like outreach.domain.com) but the SPF record isn’t set for it, it might default to an empty or incorrect policy.

Fix:

Create a dedicated SPF record for each subdomain used. Don’t assume the root domain SPF applies unless explicitly configured.

9. ESP or SMTP Settings Misaligned

Sometimes, the email platform may send using internal relay servers or bounce handlers that aren’t listed in your SPF.

Even if the front-end tool looks legit, SPF fails in the background.

Fix:

Check your tool’s SMTP relay or mail agent settings. Ensure that SPF covers the actual envelope sender—not just the visible “From” address.

10. Poor Bounce Path Configuration

If your Return-Path or envelope sender is handled by a third-party domain (common in cold outreach), SPF can break because the bounce domain doesn’t match your DNS records.

Fix:

Customize the Return-Path to use your domain (e.g., bounces@yourdomain.com). Most cold email platforms offer a setting to configure this.

Next, let's learn how to fix SPF authentication failed error in Google Workspace.

Troubleshoot SPF issues in Google Workspace

If your cold emails are failing SPF checks or landing in spam, use these steps to identify and fix the issue.

1. Check Your SPF Record

Use the Google Admin Toolbox - Check MX to validate your SPF record.

Make sure:

- Your SPF record starts with v=spf1.

- It includes include:_spf.google.com for Gmail.

- You only have one SPF TXT record.

- It ends with a mechanism like ~all or -all.

Example:

v=spf1 include:_spf.google.com ip4:123.123.123.123 ~all

Include your sending tool’s IP or domain using ip4, ip6, or include.

2. Ensure Your Sending IP Is Authorized

If your cold email tool sends emails on your behalf, the sending IP must be listed in your SPF record.

Steps:

- Get the sending IP from your tool’s documentation or from the email header.

- Add it using the ip4: or include: mechanism in your SPF record.

- Wait up to 48 hours for DNS changes to propagate.

3. Avoid the DNS Lookup Limit

SPF supports a maximum of 10 DNS lookups. Exceeding this breaks authentication.

Each include, a, mx, or ptr adds to the count.

Fix it by:

- Removing unused includes.

- Flattening includes by replacing them with IP addresses.

- Using tools like SPF Flattening or DMARC Analyzer to simplify the record.

4. Inspect Message Headers for SPF Results

Send a test email and check the headers. Look for this line:

Authentication-Results: ... spf=pass / fail / softfail / neutral / temperror / permerror

What each result means:

- pass: SPF is working

- fail: The IP is not authorized

- softfail: IP not listed, but not strictly blocked

- neutral: No stance taken

- temperror: Temporary DNS issue

- permerror: SPF syntax error or too many lookups

Fix the record based on the result.

5. Avoid Common Mistakes

- Don’t use multiple SPF records—combine all into one.

- Don’t forget to include cold email platforms' sending IPs.

- Use ~all (softfail) if you’re still testing, and -all (fail) once confident.

Troubleshoot SPF issues in Outlook

If you use Outlook (Microsoft 365) for cold outreach and your emails are going to spam or failing SPF checks, follow these steps to fix it:

1. Make sure your SPF record includes Microsoft

For Outlook-based sending, your SPF record must include:

include:spf.protection.outlook.com

Example of a correct SPF record if you only send through Microsoft:

v=spf1 include:spf.protection.outlook.com -all

If you're also using a cold email tool, you need to include their sending IPs too.

Example:

v=spf1 include:spf.protection.outlook.com include:_spf.yourtool.com -all

2. Check for multiple SPF records

You should only have one SPF record per domain. If you have more than one, SPF will fail.

Fix: Merge all include: entries into a single SPF record.

3. Stay under the DNS lookup limit

SPF allows a maximum of 10 DNS lookups. Each include:, a, mx, or ptr counts as one.

Use a tool like MXToolbox to check how many lookups your record triggers.

Fix: Remove unnecessary include: mechanisms or flatten your SPF using tools like SPF Flattening from MXToolbox.

4. Inspect email headers for SPF results

Send a test email to a Gmail address, then view the full message headers.

Look for this line:

Authentication-Results: spf=

You’ll see one of these:

- spf=pass: Everything is working.

- spf=fail: The sender IP isn’t authorized in your SPF record.

- spf=softfail: The IP might not be listed, but wasn’t rejected.

- spf=neutral: No strong policy, borderline rejection.

- spf=none: No SPF record was found.

- spf=permerror: There’s a permanent error (e.g., invalid syntax).

- spf=temperror: Temporary DNS issue.

5. Make sure your outreach platform uses a custom domain

If your cold email tool sends using a shared domain, SPF won't fully align.

Use a custom domain that you control and configure SPF correctly for it.

Learn more about how to setup custom domain.

6. Wait for DNS changes to propagate

SPF updates might take a few minutes to a few hours. In some cases, up to 24–48 hours.

Final Thoughts on SPF Failures

SPF authentication failed errors are quite common but completely avoidable. SPF failures are one of the reasons your cold emails land in spam or get rejected. Most of the time, it's due to:

- Missing or misconfigured SPF records

- Not including your cold email platform in the SPF

- Hitting the DNS lookup limit

- Sending from domains you don't fully control

The good news? SPF authentication failed issues are fixable. By correctly setting up and maintaining your records, you give your emails the best shot at landing in the inbox.

Skip the SPF hassle with SmartSenders

If you're purchasing domains from SmartSenders (by Smartlead), you don't need to manually configure SPF, DKIM, or DMARC records. These domains come pre-configured and ready for warming up and sending. You can learn more about it here.

No guesswork, no DNS errors — just plug and start your outreach.

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Priya Abraham

Priya is a Senior Technical Writer and Editor with extensive experience in creating high-quality, SEO-optimized content that delivers measurable results. Specializing in technical writing, she crafts clear, concise, and valuable content that enhances online presence and establishes credibility for businesses across various industries. Priya combines her deep understanding of technical concepts with a strong focus on SEO best practices to produce content that is both informative and strategically optimized for search engines. With a passion for leveraging the power of well-crafted words, she helps organizations improve their digital footprint, drive engagement, and achieve their business objectives.

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Frequently asked questions

General Questions

What is Smartlead's cold email outreach software?

Smartlead's cold email outreach tool helps businesses scale their outreach efforts seamlessly. With unlimited mailboxes, fully automated email warmup functionality, a multi-channel infrastructure, and a user-friendly unibox, it empowers users to manage their entire revenue cycle in one place. Whether you're looking to streamline cold email campaigns with automated email warmups, personalization fields, automated mailbox rotation, easy integrations, and spintax, improve productivity, or enhance scalability with subsequences based on lead’s intentions, automated replies, and full white-label experience, our cold email tool implifies it in a single solution.

What is Smartlead, and how can it enhance my cold email campaigns?

Smartlead is a robust cold emailing software designed to transform cold emails into reliable revenue streams. Trusted by over 31,000 businesses, Smartlead excels in email deliverability, lead generation, cold email automation, and sales outreach. A unified master inbox streamlines communication management, while built-in email verification reduces bounce rates.
Additionally, Smartlead offers essential tools such as CNAME, SPF Checker, DMARC Checker, Email Verifier, Blacklist Check Tool, and Email Bounce Rate Calculator for optimizing email performance.

How does Smartlead's unlimited mailboxes feature benefit me?

Our "unlimited mailboxes" feature allows you to expand your email communications without restrictions imposed by a mailbox limit. This means you won't be constrained by artificial caps on the number of mailboxes you can connect and use. This feature makes Smartlead the best cold email software and empowers you to reach a wider audience, engage with more potential customers, and manage diverse email campaigns effectively.

How does Smartlead, as a cold emailing tool, automate the cold email process?

Smartlead’s robust cold email API and automation infrastructure streamline outbound communication by transforming the campaign creation and management processes. It seamlessly integrates data across software systems using APIs and webhooks, adjusts settings, and leverages AI for personalised content.

The cold emailing tool categorises lead intent, offers comprehensive email management with automated notifications, and integrates smoothly with CRMs like Zapier, Make, N8N, HubSpot, Salesforce, and Pipedrive. Smartlead supports scalable outreach by rapidly adding mailboxes and drip-feeding leads into active campaigns Sign Up Now!

What do you mean by "unibox to handle your entire revenue cycle"?

The "unibox" is one of the unique features of Smartlead cold email outreach tool, and it's a game-changer when it comes to managing your revenue cycle. The master inbox or the unibox consolidates all your outreach channels, responses, sales follow-ups, and conversions into one centralized, user-friendly mailbox.

With the "unibox," you gain the ability to:
1. Focus on closing deals: You can now say goodbye to the hassle of logging into multiple mailboxes to search for replies. The "unibox" streamlines your sales communication, allowing you to focus on what matters most—closing deals.
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2. Centralized lead management: All your leads are managed from one central location, simplifying lead tracking and response management. This ensures you take advantage of every opportunity and efficiently engage with your prospects.
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3. Maintain context: The "unibox" provides a 360-degree view of all your customer messages, allowing you to maintain context and deliver more personalized and effective responses.

How does Smartlead ensure my emails don't land in the spam folder?

Smartlead, the best cold email marketing tool, ensures your emails reach the intended recipients' primary inbox rather than the spam folder.
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Here's how it works:
1. Our "unlimited warmups" feature is designed to build and maintain a healthy sending reputation for your cold email outreach. Instead of sending a large volume of emails all at once, which can trigger spam filters, we gradually ramp up your sending volume. This gradual approach, combined with positive email interactions, helps boost your email deliverability rates.
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2. We deploy high-deliverability IP servers specific to each campaign.
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3. The ‘Warmup’ feature replicates humanized email sending patterns, spintax, and smart replies.

4. By establishing a positive sender reputation and gradually increasing the number of sent emails, Smartlead minimizes the risk of your emails being flagged as spam. This way, you can be confident that your messages will consistently land in the primary inbox, increasing the likelihood of engagement and successful communication with your recipients.

Can Smartlead help improve my email deliverability rates?

Yes, our cold emailing software is designed to significantly improve your email deliverability rates. It enhances email deliverability through AI-powered email warmups across providers, unique IP rotating for each campaign, and dynamic ESP matching.
Real-time AI learning refines strategies based on performance, optimizing deliverability without manual adjustments. Smartlead's advanced features and strategies are designed to improve email deliverability rates, making it a robust choice for enhancing cold email campaign success.

What features does Smartlead offer for cold email personalisation?

Smartlead enhances cold email personalisation through advanced AI-driven capabilities and strategic integrations. Partnered with Clay, The cold remaining software facilitates efficient lead list building, enrichment from over 50 data providers, and real-time scraping for precise targeting. Hyper-personalised cold emails crafted in Clay seamlessly integrate with Smartlead campaigns.

Moreover, Smartlead employs humanised, natural email interactions and smart replies to boost engagement and response rates. Additionally, the SmartAI Bot creates persona-specific, high-converting sales copy. Also you can create persona-specific, high-converting sales copy using SmartAI Bot. You can train the AI bot to achieve 100% categorisation accuracy, optimising engagement and conversion rates.

Can I integrate Smartlead with other tools I'm using?

Certainly, Smartlead cold email tool is designed for seamless integration with a wide range of tools and platforms. Smartlead offers integration with HubSpot, Salesforce, Pipedrive, Clay, Listkit, and more. You can leverage webhooks and APIs to integrate the tools you use. Try Now!

Is Smartlead suitable for both small businesses and large enterprises?

Smartlead accommodates both small businesses and large enterprises with flexible pricing and comprehensive features. The Basic Plan at $39/month suits small businesses and solopreneurs, offering 2000 active leads and 6000 monthly emails, alongside essential tools like unlimited email warm-up and detailed analytics.

Marketers and growing businesses benefit from the Pro Plan ($94/month), with 30000 active leads and 150000 monthly emails, plus a custom CRM and active support. Lead generation agencies and large enterprises can opt for the Custom Plan ($174/month), providing up to 12 million active lead credits and 60 million emails, with advanced CRM integration and customisation options.

What type of businesses sees the most success with Smartlead?

No, there are no limitations on the number of channels you can utilize with Smartlead. Our cold email tool offers a multi-channel infrastructure designed to be limitless, allowing you to reach potential customers through multiple avenues without constraints.
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This flexibility empowers you to diversify your cold email outreach efforts, connect with your audience through various communication channels, and increase your chances of conversion. Whether email, social media, SMS, or other communication methods, Smartlead's multi-channel capabilities ensure you can choose the channels that best align with your outreach strategy and business goals. This way, you can engage with your prospects effectively and maximize the impact of your email outreach.

How can Smartlead integrate with my existing CRM and other tools?

Smartlead is the cold emailing tool that facilitates seamless integration with existing CRM systems and other tools through robust webhook and API infrastructure. This setup ensures real-time data synchronisation and automated processes without manual intervention. Integration platforms like Zapier, Make, and N8N enable effortless data exchange between Smartlead and various applications, supporting tasks such as lead information syncing and campaign status updates. Additionally, it offers native integrations with major CRM platforms like HubSpot, Salesforce, and Pipedrive, enhancing overall lead management capabilities and workflow efficiency. Try Now!

Do you provide me with lead sources?

No. Smartlead distinguishes itself from other cold email outreach software by focusing on limitless scalability and seamless integration. While many similar tools restrict your outreach capabilities, Smartlead offers a different approach.

Here's what makes us uniquely the best cold email software:

1. Unlimited Mailboxes: In contrast to platforms that limit mailbox usage, Smartlead provides unlimited mailboxes. This means you can expand your outreach without any arbitrary constraints.

2. Unique IP Servers: Smartlead offers unique IP servers for every campaign it sends out.

3. Sender Reputation Protection: Smartlead protects your sender reputation by auto-moving emails from spam folders to the primary inbox. This tool uses unique identifiers to cloak all warmup emails from being recognized by automation parsers.

4. Automated Warmup: Smartlead’s warmup functionality enhances your sender reputation and improves email deliverability by maintaining humanised email sending patterns and ramping up the sending volume.

How secure is my data with Smartlead?

Ensuring the security of your data is Smartlead's utmost priority. We implement robust encryption methods and stringent security measures to guarantee the continuous protection of your information. Your data's safety is paramount to us, and we are always dedicated to upholding the highest standards of security.

How can I get started with Smartlead?

Getting started with Smartlead is straightforward! Just head over to our sign-up page and follow our easy step-by-step guide. If you ever have any questions or need assistance, our round-the-clock support team is ready to help, standing by to provide you with any assistance you may require. Sign Up Now!

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