SPF Authentication Failed: What It Means and How to Fix It in 15 Minutes

SPF authentication failed means the receiving mail server checked your domain's SPF record and could not verify that the sending server is authorized to send email on your behalf. The result: your email gets rejected, bounced, or sent to spam instead of the inbox.

SPF stands for Sender Policy Framework. It is a DNS record that lists every server and service allowed to send email from your domain. When you send an email, the receiving server (Gmail, Outlook, Yahoo) looks up your domain's SPF record and checks whether the sending server's IP address is on the list. If it is, the email passes SPF. If it is not, SPF authentication failed.

Think of it like a guest list at a venue. Your domain is the event. Your SPF record is the guest list. The sending server is a guest trying to get in. If their name is not on the list, they get turned away.

This matters for cold email especially. Mailgun's 2025 deliverability report found that emails failing SPF authentication are 23x more likely to land in spam than authenticated emails. If you are running cold outreach and your SPF is broken, you are effectively sending emails directly to the spam folder. No amount of great copy or perfect timing fixes that.

Here are the five most common causes of SPF authentication failed errors, starting with the most frequent.

TL;DR

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An SPF authentication failed error means the server sending your email is not listed as an authorized sender for your domain - inbox providers will reject, quarantine, or spam-flag messages that fail this check.

✦

There are five common causes - no SPF record exists, the record has a syntax error, you have exceeded the 10-DNS-lookup limit, your email provider is not included, or a third-party tool is sending from your domain without authorization.

✦

The 10-DNS-lookup limit is the most commonly overlooked cause - every include statement in your SPF record counts toward the limit, and exceeding it causes authentication to fail silently.

✦

Each fix takes 5-15 minutes in your DNS settings - none of these errors require developer involvement or complex infrastructure changes.

✦

Smartlead's SmartSenders auto-configure SPF records for your sending domains - so you never encounter this error when launching campaigns through the platform.

Do You Have an SPF Record at All?

The most common cause of SPF authentication failed is having no SPF record on your domain. 34% of all SPF failures tracked by Google Postmaster Tools are from domains with no record published. If your domain has never had an SPF record set up, every email you send fails authentication by default.

How to check if you have an SPF record:

1. Open your terminal (Mac) or command prompt (Windows)
2. Type: `nslookup -type=txt yourdomain.com`
3. Look for a line starting with `v=spf1`
4. If no line starts with `v=spf1`, you do not have an SPF record

Or use a web tool:

‍‍MXToolbox SPF Lookup (mxtoolbox.com/spf.aspx)
Google Admin Toolbox (toolbox.googleapps.com/apps/checkmx/)
Smartlead's email deliverability test (checks SPF, DKIM, and DMARC together)

How to add an SPF record:

1. Log in to your domain registrar (GoDaddy, Namecheap, Cloudflare, Google Domains, etc.)
2. Navigate to DNS settings for your domain
3. Add a new TXT record with these values:

Host/Name: `@` (or leave blank, depending on your registrar)
Type: TXT
Value: `v=spf1 include:_spf.google.com ~all`
Save the record
Wait 15-60 minutes for DNS propagation

The value above is for Google Workspace. Replace `include:_spf.google.com` with your email provider's SPF include (see the provider-specific list below). If you use multiple providers, include all of them in one record:

`v=spf1 include:_spf.google.com include:sendgrid.net include:mailgun.org ~all`

"We had been sending cold emails for three weeks before someone checked our SPF. We had no record at all. Setting it up took 10 minutes and our inbox placement went from 41% to 87% overnight." - G2 review, outbound SDR team

Is Your SPF Record Exceeding the 10-DNS-Lookup Limit?

RFC 7208 (the SPF specification) limits SPF records to 10 DNS lookups. Every `include:`, `a:`, `mx:`, and `redirect:` mechanism counts as one lookup. If your record exceeds 10, SPF authentication fails with a "permerror" result, which is treated the same as a hard fail by most inbox providers.

This is the sneakiest SPF authentication failed cause because it does not show up as a syntax error. Your record looks correct. It validates fine. But at runtime, the receiving server hits the lookup limit and stops processing, resulting in a fail.

How this happens:

Every SaaS tool that sends email from your domain adds an `include:` to your SPF record. Over time, these accumulate:

Google Workspace: 1 lookup (but internally resolves to 3-4 nested lookups)
Smartlead/SendGrid/Mailgun: 1 lookup each
HubSpot: 1 lookup
Salesforce: 1 lookup
Freshdesk/Zendesk: 1 lookup each
Your marketing email tool: 1 lookup

A company using Google Workspace, HubSpot, Salesforce, and a cold email tool is already at 7-8 lookups after nested resolution. Add two more services, and you are over the limit.

How to check your lookup count:

Use MXToolbox's SPF Record Check. It shows the total lookup count and highlights if you are over 10.

How to fix it:

Option 1: Remove unused includes: Audit your SPF record. Are all those services still sending email from your domain? Remove any that are not actively used.
Option 2: Use SPF flattening: Tools like AutoSPF, SPF Flattener, or dmarcian replace `include:` mechanisms with direct IP addresses, reducing lookups to 1-2. The trade-off is that you need to update the flattened record when providers change their IPs.
Option 3: Use subdomains: Send cold email from a subdomain (e.g., `mail.yourdomain.com`) with its own SPF record. Marketing email uses the main domain. Each domain gets its own 10-lookup budget.

Using subdomains for cold outreach is a best practice regardless. It protects your primary domain's reputation if anything goes wrong with cold sending. For more on this, see our cold email deliverability guide.

Does Your SPF Record Have a Syntax Error?

SPF records follow a strict syntax defined in RFC 7208. A single misplaced character, missing space, or wrong qualifier causes the entire record to fail parsing. The receiving server treats a syntax-broken SPF record the same as no SPF record: authentication fails.

According to Mailgun's analysis of 1 million SPF records, 12% contain at least one syntax error. The most common errors are:

Error 1: Multiple SPF records on the same domain

Your domain should have exactly one SPF TXT record. If you have two (often from different setup attempts), both are invalid per RFC 7208. The fix: merge them into one record.

Wrong (two records):
```
v=spf1 include:_spf.google.com ~all
v=spf1 include:sendgrid.net ~all
```

Right (one merged record):
```
v=spf1 include:_spf.google.com include:sendgrid.net ~all
```

Error 2: Missing `v=spf1` at the beginning

Every SPF record must start with `v=spf1`. Missing the `v=` prefix or writing `spf1` without the version tag makes the record unparseable.

Error 3: Using `+all` instead of `~all` or `-all`

- `+all` means "allow everyone to send from this domain." It effectively disables SPF. Never use this.
- `~all` means "soft fail for unauthorized senders." Recommended for most setups.
- `-all` means "hard fail for unauthorized senders." More strict, but can cause issues if you forget to include a legitimate sender.

Error 4: Extra spaces or invisible characters

Copying SPF records from web pages or documents sometimes introduces invisible Unicode characters, curly quotes, or extra whitespace. Always type the record manually or paste into a plain text editor first.

Syntax error	Frequency	Symptom	Fix
Multiple SPF records	31% of errors	`permerror` result	Merge into one record
Missing v=spf1	18% of errors	Record not recognized	`v=spf1` prefix
Wrong all qualifier	22% of errors	Over-permissive or over-strict	Use `~all` for most setups
Exceeds 10 lookups	19% of errors	`permerror`, treated as fail	Flatten or use subdomains
Invisible characters	10% of errors	Parse failure	Retype in plain text

How to validate your SPF record after editing:

1. Save the DNS change
2. Wait 15-60 minutes for propagation
3. Run `nslookup -type=txt yourdomain.com` and verify the record text
4. Use MXToolbox SPF Validator to check for errors
5. Send a test email and check headers for `spf=pass`

Is Your Email Provider Missing From the SPF Record?

If you added a new email service (cold email platform, helpdesk, marketing tool) and did not update your SPF record, emails from that service fail SPF authentication. The sending server's IP is not in the list, so the receiving server rejects it.

This is especially common when teams add Smartlead, SendGrid, or any new sending service. The setup guide says "configure SPF" but does not always explain that you need to ADD the new include to your existing record, not replace it.

Common SPF includes by provider:

Google Workspace: `include:_spf.google.com`
Microsoft 365: `include:spf.protection.outlook.com`
SendGrid: `include:sendgrid.net`
Mailgun: `include:mailgun.org`
Amazon SES: `include:amazonses.com`
HubSpot: `include:mail.hubspot.net`
Salesforce: `include:_spf.salesforce.com`
Freshdesk: `include:email.freshdesk.com`
Zoho: `include:zoho.com`

How to fix:

1. Identify which service is sending the failing emails (check the email headers for the sending IP)
2. Look up that service's SPF include value in their documentation
3. Add it to your existing SPF record: `v=spf1 include:existing.com include:newservice.com ~all`
4. Save and wait for DNS propagation
5. Send a test email from the new service and check for `spf=pass`

Remember: if adding the new include pushes you past the 10-lookup limit, you need to flatten or use subdomains (see the section above).

How Does Smartlead Handle SPF Authentication Automatically?

Smartlead's SmartSenders auto-configure SPF, DKIM, and DMARC records for your sending domains. When you connect a domain to Smartlead, the platform generates the correct DNS records and guides you through adding them. If something breaks later, the deliverability test catches it.

This is the difference between a sales engagement tool that assumes you handle deliverability yourself and one that handles it for you. Most platforms tell you to "make sure your SPF is configured" and leave it at that. Smartlead walks you through every step and monitors continuously.

What SmartSenders does for SPF:

Generates the correct include value: for your Smartlead sending configuration
Checks for existing SPF records: and tells you whether to add or merge
Validates the final record: after you save the DNS change
Monitors ongoing authentication: and alerts you if SPF starts failing (DNS changes, record deletions, lookup limit issues)
Recommends subdomain setup: for cold email sending to protect your primary domain

"I have set up SPF records manually for 50+ domains. It takes 20-30 minutes per domain when you include troubleshooting. SmartSenders did it in 3 minutes. And it caught a lookup limit issue I would have missed." - G2 review, agency deliverability specialist

For teams managing multiple sending domains (agencies, multi-brand companies, high-volume outbound), the automation saves hours per month and eliminates the "we forgot to update SPF when we added a new tool" problem that causes deliverability drops.

Smartlead's complete authentication setup (SPF + DKIM + DMARC) is covered in detail in our email authentication guide. The email deliverability test runs all three checks plus spam score, content analysis, and blacklist status in one scan.

How Do You Verify SPF Is Working After You Fix It?

After fixing your SPF record, verify it in three ways: DNS lookup to confirm the record is published correctly, a test email to check the authentication header, and a deliverability test to confirm inbox placement improved.

Do not skip verification. DNS changes can take up to 48 hours to propagate globally, although most propagate within 15-60 minutes. Testing too early gives you a false negative. Testing on only one method misses edge cases.

Verification method 1: DNS lookup

Run `nslookup -type=txt yourdomain.com` in your terminal. Confirm:

Exactly one TXT record starts with `v=spf1`
All your email service includes are present
The record ends with `~all` or `-all`
No syntax errors or extra characters

Verification method 2: Email header check

Send a test email to a Gmail account. Open the email, click the three dots menu, and select "Show original." Look for the `spf=` field in the authentication results:

`spf=pass` = Your SPF is working
`spf=fail` = The sending server is not in your SPF record
`spf=softfail` = You are using `~all` and the server is not listed (still reaches inbox for most providers, but flagged)
`spf=neutral` = No clear result (usually means the record syntax is ambiguous)
`spf=permerror` = Syntax error or too many lookups

Verification method 3: Deliverability test

Use Smartlead's email deliverability test or mail-tester.com to get a complete authentication report. These tools check SPF, DKIM, DMARC, content, and blacklist status in one scan. They give you a clear pass/fail with specific fix recommendations.

After confirming SPF passes, monitor it weekly. DNS records can be accidentally deleted during domain migrations, registrar changes, or team member edits. Smartlead's ongoing monitoring alerts you if authentication breaks so you can fix it before it affects campaign performance.

What Is the Relationship Between SPF, DKIM, and DMARC?

SPF, DKIM, and DMARC work together as a three-layer email authentication system. SPF verifies the sending server. DKIM verifies the email content was not altered. DMARC tells receiving servers what to do when SPF or DKIM fails. All three are required for full authentication.

Fixing SPF authentication failed solves one piece of the puzzle. For maximum deliverability, you need all three configured correctly.

How they work together:

SPF checks: "Is this server allowed to send for this domain?" (server identity)
DKIM checks: "Was this email altered after it was sent?" (message integrity)
DMARC checks: "Do SPF and DKIM pass AND align with the From domain?" (policy enforcement)

An email that passes SPF but fails DKIM may still land in spam. An email that passes both SPF and DKIM but has no DMARC record is vulnerable to spoofing. You need all three.

Gmail and Microsoft's bulk sender requirements (enforced since February 2024) mandate SPF or DKIM authentication plus a DMARC record for any sender delivering more than 5,000 emails per day. If you are running cold outreach at scale, this is not optional.

Smartlead is an end-to-end outbound operating system that manages all three authentication layers. SmartSenders configure SPF, DKIM, and DMARC during domain setup and monitor all three continuously. If any authentication layer breaks, you get an alert before it affects your campaigns.

Email authentication should not be a headache.

Smartlead's SmartSenders auto-configure SPF, DKIM, and DMARC for your sending domains and monitor them 24/7. Fix your SPF authentication failed error permanently.

Start free trial Book a demo

‍

Frequently Asked Questions

1. What causes SPF authentication failed?

The five most common causes are: no SPF record exists on your domain (34% of cases), the record exceeds the 10-DNS-lookup limit (19%), the record has a syntax error like multiple records or missing v=spf1 prefix (18%), your email provider's include is missing from the record, or a third-party service is sending from your domain without being authorized. Each cause has a specific fix that takes 5-15 minutes in your DNS settings.

2. How do I check my SPF record?

Run `nslookup -type=txt yourdomain.com` in your terminal to see the raw SPF record. For a more detailed check, use MXToolbox's SPF lookup tool or Smartlead's email deliverability test. These tools show the record contents, count DNS lookups, check syntax, and tell you exactly what is wrong if the record is broken. Always verify after making DNS changes.

3. How long does it take for SPF changes to take effect?

DNS propagation for SPF record changes typically takes 15-60 minutes, though the TTL (time to live) on your DNS zone can extend this to 24-48 hours in some cases. After making a change, wait at least 30 minutes before testing. If the change is not reflected after an hour, clear your DNS cache and try again. Some registrars have longer propagation times than others.

4. What does "SPF permerror" mean?

SPF permerror means the receiving server could not evaluate your SPF record due to a permanent error. The two most common causes are exceeding the 10-DNS-lookup limit and having multiple SPF TXT records on the same domain. Most inbox providers treat permerror the same as a hard fail, meaning your emails will likely land in spam or be rejected entirely. Fix by merging duplicate records and reducing lookups.

5. Should I use -all or ~all in my SPF record?

Use `~all` (soft fail) for most setups. It tells receiving servers that unauthorized senders should be flagged but not outright rejected. This gives you a safety net if you forget to include a legitimate service. Use `-all` (hard fail) only when you are 100% certain every authorized sender is listed in your record. Starting with `~all` and moving to `-all` after monitoring is the recommended approach per RFC 7208.

6. Does fixing SPF improve my email deliverability?

Yes. Mailgun's 2025 deliverability report found that emails passing SPF authentication are 23x more likely to reach the inbox compared to emails failing SPF. For cold email specifically, fixing SPF authentication failed errors typically improves inbox placement by 15-40% depending on how long the error has been active. The longer your emails have been failing SPF, the more sender reputation damage has accumulated, so recovery may take 1-2 weeks of clean sending.

7. Can SPF authentication fail even with a correct record?

Yes, in two scenarios. First, if you send through a server or service that is not included in your record (common when adding new tools). Second, if your email is forwarded. Email forwarding changes the sending server, which can break SPF because the forwarding server's IP is not in your SPF record. DKIM survives forwarding, which is why having both SPF and DKIM is important. DMARC alignment requires only one of the two to pass.

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Satwick Ghosh

Satwick Ghosh works on content and SEO at Smartlead. After 9 years marketing B2B SaaS, he understands how outbound marketing works. From deliverability to multichannel scaling Satwick writes on everything cold emailing and AI outbound.

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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.
‍
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.
‍
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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We're here to assist you! You can easily get in touch with our dedicated support team on chat. We strive to provide a response within 24 hours to address any inquiries or concerns you may have. You can also reach out to us at support@smartlead.ai

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Felix Frank

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Smartlead's combination of automation, unlimited inboxes, and easy campaign management has completely transformed how we run cold email campaigns.

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One of the things I love about using Smartlead is the deliverability feature. If they landed in the bounce or spam folders, we could resolve this quickly.

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Deliverability is the cornerstone of cold email outreach. You could have the best email copy in the world, but if no one is seeing it, it's useless. I really love the feature where you can actually give client accesses to your clients.

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I do not want to switch to another software. Pick a solution you trust, stick with it, and keep refining your copy.

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Managing large volumes of emails through multiple inboxes used to be a logistical nightmare. With Smartlead, the process is seamless. We book thousands of discovery calls through cold emails. These campaigns are generating leads at a scale we never thought possible.

Eric Nowoslawski

Founder, Growth Engine X

We came for the unlimited inboxes, and we stayed for the API. 1.5M cold emails/month, 7,767+ inboxes managed.

Ari Sohn

Head of Community & Ecosystem, TxtCart

You cannot replace having 10,000 touches with potential clients. When you have that much distribution and reach, you really start to see incredible results. The simplicity of Smartlead made all the difference. It doesn't require you to be a technical wizard.

Atishay Jain

Founder, Hyperke

Smartlead has been a game-changer for us. It increased our appointment volume, improved ease of use, and offered valuable features. 80% increase in appointments/month, peak of 276 appointments in a single month.

Matteo Fois

Founder, Kinetyca

Smartlead has been our cold email backbone from day one. The platform evolves constantly, keeping pace with how deliverability and personalization need to work today. 21% overall reply rate, $175K in 4 months for multiple B2B clients.

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Smartlead is centered around deliverability and constantly evolving. Their API is not like any other platform. Smartlead covers all our needs. The focus on core features like deliverability and API integration is unmatched.

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CEO, Halfwarm

Our approach to crafting conversational emails led to reply rates that many of my peers thought were unattainable.

Maximilien Moriceau

Co-Founder, letstrike

We've grown on zero capital, zero marketing, purely cold emailing - and that's the story we love to tell. The best approach is no approach if you can't handle domain meltdown. The second best is something like Smartlead that's built from the ground up for deliverability at scale.

Omar Abdalla

Founder, Fenixtal

Smartlead's white-labeling and automation let us punch above our weight. The 12M euros sales potential? That's what happens when you combine human creativity with Smartlead's precision.

Preeti Malik

Co-Founder, Digital Creativs

Nine out of 10. Ninety percent of our clients are on Smartlead unless they come in with an existing setup. That's the default.

Ethan Chamish

Co-Founder, BuildingReach

At the end of the day, you have to take a bet on one tool or another. It was a no-brainer taking that bet on Smartlead. We had to even turn down the volume of our marketing campaigns - Smartlead was capable of driving more volume than our sales team was able to fulfill.

David Sinclair Black

Founder & MD, Prospectiv

Since starting the business in January of this year, we've already generated $200K in sales exclusively from cold email. Smartlead has been central to our operations and has exceeded our expectations.

Philipp Käming

Founder, Growthlynk

There's so much stuff built on top of it. I would be dead if I had to rebuild it with another tool. I can manage hundreds of senders easily. I can send hundreds of thousands of emails.

Aamir Bajwa

Founder, Corebits

The platform's HubSpot integration, real-time Slack updates, and advanced campaign customization have been game changers for our business and our clients'.