Case Study

How Eric Nowoslawski Sends 1.5 Million Cold Emails Monthly?

Priya Abraham
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February 24, 2026
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For every business, generating leads and closing sales is integral to staying relevant in the market. At a time when businesses are turning to other digital mediums to locate their customers and where the traditional cold email approach - where you send bulk emails, feels outdated, resource-intensive, and prone to ending up in spam folders.

Growth Engine X, an outbound agency led by Eric Nowoslawski - a popular name in the cold emailing world, challenges this perception by demonstrating how a well-crafted cold email strategy, combined with the right tools, can be a powerful and predictable lead-generation machine.

This case study delves into Eric and Growth Engine X's innovative approach, how they send bulk emails focused on generating leads, exploring its methodology, achievements, and the role Smartlead played in its success.

Eric Nowoslawski: The Cold Emailing Mastermind Driving Success at Growth Engine X

Eric Nowasowski is the brain behind Growth Engine X, a company specializing in reaching out to potential customers through cold emails.

Eric stumbled into this field when he unexpectedly found himself in a sales role and discovered a book titled "Fanatical Prospecting" by Jeb Blount that changed his perspective on prospecting. Since then, he's been obsessed with perfecting the art of cold emailing.

Starting with basic tools like Excel and manual processes, Eric quickly started using software like Apollo and GMass.

His time at Clay.com not only helped shape the product but also allowed him to become one of its biggest users, using it to supercharge Growth Engine X's outreach efforts.

Today, Eric and his team leverage the infra of tools like Clay.com and Smartlead to send bulk emails, reaching an impressive 1.5 million cold emails every month on behalf of their clients, solidifying Growth Engine X's reputation as a leader in the field of cold email marketing.

The ideal customers for Growth Engine X encompass a broad spectrum, including many SaaS companies, but their scope extends beyond any specific niche. For them, their clients must meet the following criteria:

  • Firstly, the customer's lifetime value should hover around $10,000 annually, with a sales cycle ideally under six months. A longer sales cycle can hinder their ability to deliver tangible ROI, thus impacting the effectiveness of their efforts.
  • Moreover, they seek to collaborate with companies offering non-commoditized products or services, ideally backed by compelling case studies.

This combination sets the stage for successful cold email campaigns. Organizational elements are necessary for their efforts to be better spent on internal groundwork specific to each business.

Once these prerequisites are met, Eric and Growth Engine X can unleash their full potential and drive remarkable results.

Inside Growth Engine X: How Eric's Team Works Wonders

At Growth Engine X, Eric and his team follow a systematic approach to send bulk emails and run campaigns, emphasizing value propositions, problem statements, and case studies in their messaging strategy.

They employ an AI-generated first line to mitigate spam concerns and then present value propositions tailored to the recipient's needs.

Their methodology involves iterating through cycles of value propositions, problem statements, and case studies to gauge effectiveness.

By dissecting each component of their emails, they ensure clarity and relevance in their communication. This approach enables them to identify what resonates most with their target audience and refine their messaging accordingly.

Furthermore, Eric emphasizes the importance of rapid experimentation and learning. Rather than waiting for weeks to assess the effectiveness of a particular strategy, they front-load their testing process, swiftly iterating through different triggers and messages.

Ultimately, Eric's focus is not solely on achieving high response rates but also on the efficiency and effectiveness of their process.

Challenges Faced Before Using Smartlead

Prior to integrating Smartlead into their workflow, Eric and Growth Engine X encountered several challenges to send bulk emails that impeded their outbound marketing efforts. The primary hurdles included:

  • High Costs for Multiple Inboxes: Maintaining high deliverability rates necessitated paying for multiple inboxes, which proved to be an excessive expense. This financial strain was a significant obstacle to their operations.
  • Lack of API Access for Scalability: Another crucial limitation was the absence of API access, which hindered their ability to execute tasks at scale efficiently. Without this capability, their operations were constrained, preventing them from realizing their full potential.

The Smartlead Difference

Eric was one of the early adopters of Smartlead. Eric and his team found that Smartlead was able to address their previous challenges head-on.

The platform's provision of unlimited inboxes was a game-changer when it came to send bulk emails, instantly alleviating the financial burden associated with maintaining multiple inboxes.

Moreover, the availability of an API empowered them to customize their workflow, enabling seamless integration with their internal analytics systems.

In essence, while they initially gravitated towards Smartlead for its unlimited inbox feature, they remained loyal due to the platform's robust API capabilities.

In Eric’s words, ‘We came for the unlimited inboxes, and we stayed for the API.’

By combining unlimited scalability and powerful API access, Smartlead empowered Growth Engine X to transform its cold email marketing infrastructure.

This shift enabled them to automate tasks, personalize communications, and optimize their outreach efforts for greater efficiency and effectiveness, contributing to their overall growth.

Smartlead has revolutionized the way Eric and Growth Engine X conduct their business, addressing several key challenges and enhancing their operations in significant ways:

  • Advanced Campaign Monitoring: Managing a vast volume of cold email campaigns, totaling 1.5 million emails per month, posed a daunting task. Prior to Smartlead, this required manual monitoring or a robust API. However, Eric and his team gained comprehensive insights into campaign performance by extracting data from the Smartlead interface and integrating it into their ClickUp database. They meticulously tracked metrics such as open rates, reply rates, positive responses, and bounce rates on both a daily and weekly basis.
  • Efficient Inbox Management: Smartlead empowers Growth Engine X to adapt swiftly to evolving campaign requirements. Additionally, Smartlead's automatic addition of contacts to a block list upon hitting "do not contact" status provides peace of mind and ensures compliance with regulatory requirements. This feature, coupled with seamless integration with their CRM system via Clay, enables efficient lead management and facilitates campaign reusability.

Using Smartlead has significantly enhanced the response rates for Growth Engine X's campaigns, ushering in unprecedented success. While Eric acknowledges the importance of revenue generation, he prefers to delve deeper into the process behind achieving remarkable reply rates.

Furthermore, Eric underscores the significance of Smartlead in achieving scalability. With over 7,767 inboxes managed seamlessly, they've tackled the challenge of scale, allowing them to focus on refining data and messaging strategies. Their expertise enables them to craft highly customized lists and segment messages effectively, maximizing engagement and response rates.

Roadmap For Success

For Eric and his team at Growth Engine X, the foundation of their success lies in the ongoing refinement of outbound strategies through experimentation.

Harnessing Smartlead's powerful features, including unlimited mailboxes, global analytics, and API access, they've constructed an entire cold emailing infrastructure tailored to their audience's needs and preferences.

However, amidst the plethora of available features, Eric emphasizes simplicity. He keeps his approach straightforward, focusing on delivering solid offers to the right audience.

While Smartlead facilitates the outbound process efficiently, Eric underscores the importance of focusing on metrics that truly matter, such as the email-to-deal ratio.

By prioritizing revenue generation over vanity metrics, Eric ensures that his efforts yield tangible results, driving sustainable growth for his business.

Conclusion

Smartlead's API access and unlimited mailboxes have revolutionized Growth Engine X's outreach capabilities, fostering scalability, automation, and tailored solutions.

These features eliminate financial constraints, allowing businesses to broaden their reach, boost campaign volume, and optimize targeting.

Whether you're a startup or an established enterprise, Smartlead can help you send bulk emails, catalyzing your outbound marketing success and propelling your business toward unparalleled growth.

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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

What is Smartlead's cold email outreach software?
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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.

How does Smartlead's unlimited mailboxes feature benefit me?
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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.

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

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.

Can Smartlead help improve my email deliverability rates?
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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.

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

What is Smartlead, and how can it enhance my cold email campaigns?
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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, as a cold emailing tool, automate the cold email process?
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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!

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

2. We deploy high-deliverability IP servers specific to each campaign.

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.

What features does Smartlead offer for cold email personalisation?
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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.

Is Smartlead suitable for both small businesses and large enterprises?
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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.