Case Study

How Halfwarm Leveraged Smartlead for Outstanding Lead Generation Success

Priya Abraham
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February 24, 2026
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Did you know that email marketing can drive 50% more sales than other lead generation methods? Yet, many marketers struggle to fully tap into this potential. In fact, while most marketers are keenly aware of their lead generation numbers, a surprising 12% admit they don’t even know how many leads they’re pulling in.

This calls for a more organized approach towards lead generation that goes beyond a simple spray and pray method.

Maximilian Jendrall, an entrepreneur and a lead generation expert based in Berlin, Germany, understood these challenges all too well. 

With a rapidly growing agency that initially focused on German companies, Max quickly expanded to serve international clients. His mission was clear: to master the art of email outreach and drive consistent, measurable results for his clients. 

However, as his business grew, so did the complexities. That's where Smartlead came into play, transforming the way Max's agency approached email marketing and lead generation.

About Maximilian Jendrall And His Journey With Lead Generation 

Maximilian Jendrall, known as Max, is an operator and entrepreneur with a deep passion for building profitable, data-driven, and self-sustainable businesses. As the Founder and CEO of both Halfwarm ((known as Halbwarm in Germany) and Inbrox, Max has dedicated his career to optimizing business operations and scaling sales with precision. Halfwarm serves as a comprehensive sales operations partner, offering infrastructure, data, and expert consulting to ensure seamless scaling. 

Meanwhile, Inbrox specializes in Ops-Engineering as a Service, focusing on constructing business-driven data pipelines, dashboards, and digitizing processes to drive efficiency and growth. Max’s expertise lies in combining data with strategy to build ventures that not only thrive but also sustain long-term success.

Halfwarm started with a simple yet powerful mission: to leverage cold email outreach to generate leads for German companies. 

The success of this model spurred the agency to take on international clients, broadening its scope and reach. As the business evolved, Max didn't just stop at lead generation. He expanded into the tech space, creating a full-service offering that included lead aggregation, closing deals, and partnering with other companies to streamline fulfillment. 

This approach positioned his agency as a growth partner for clients, handling everything from lead generation to final conversions.

The Challenges Faced Before Using Smartlead

Before using Smartlead, Halfwarm faced several key issues that affected their outbound marketing efforts:

  • Cost Structure Problems: Halfwarm faced significant issues with the cost structures of other marketing platforms. The pay-per-inbox pricing model proved impractical for their operations, given that they managed thousands of inboxes across various workspaces. Despite being a profitable agency, the costs associated with this model were disproportionately high. The pricing model did not align with the value provided, making it a financial strain and impeding their ability to scale efficiently.
  • Difficulties with Client Access: Another major challenge was the inefficient and rigid management of client access to inboxes. Halfwarm’s tech-savvy team, well-versed in the intricacies of such platforms, found this aspect particularly frustrating. The lack of flexibility in managing client access not only caused operational headaches but also hindered their ability to deliver a seamless service experience.
  • Limited Integration: The integration capabilities of the platforms Halfwarm was using were insufficient, which significantly affected their workflow. The inability to integrate seamlessly with other tools and systems made it challenging to automate and streamline processes effectively. This limitation stymied the agency’s efforts to enhance efficiency, automate tasks, and scale their operations, ultimately impacting their growth potential.

The Solution: Why Smartlead

Smartlead quickly emerged as the solution to Halfwarm's outbound marketing challenges, thanks to strong recommendations from industry experts and mentors Max trusted. Here's why Smartlead stood out:

  • Top-Tier API: Max highlighted that Smartlead’s API stands out as the best in the market. For Halfwarm’s tech-focused team, this was a crucial factor. The platform's robust API capabilities enabled seamless integration with other tools, simplifying and enhancing the effectiveness of automation. This top-tier API made it easier for Halfwarm to connect various systems and streamline their processes, boosting overall efficiency.
  • Comprehensive Feature Set: Smartlead provided a comprehensive feature set that matched other platforms but excelled in stability and integration. According to Max, Smartlead offers all the essential features found in competing platforms, but with superior reliability. The platform’s ability to manage large-scale campaigns effectively without sacrificing performance was a game-changer, giving Halfwarm a competitive edge in campaign management.
  • Streamlined Campaign Orchestration: One of the significant advantages of Smartlead was its ability to handle large-scale campaigns with ease. Max valued how the platform enabled efficient orchestration of campaigns, allowing his team to focus on crafting and executing successful outbound strategies. The streamlined campaign management helped Halfwarm maintain high performance while managing complex campaigns effectively.
  • Efficient Automation: Smartlead’s seamless API integrations facilitated effective automation, which was a major benefit for Halfwarm. Max noted that these automation features not only saved time but also reduced logistical pressures on his team. By alleviating the burden of manual processes, Smartlead allowed the team to concentrate on what truly matters—executing impactful outbound campaigns.

Overall, Smartlead's reliability, feature set, and automation capabilities transformed how Halfwarm approached outbound marketing, driving better results and efficiency.

The Results

The transition to Smartlead led to remarkable improvements for Halfwarm, showcasing exceptional results:

  • High Reply Rates: Max’s team experienced impressive reply rates of up to 50% in the U.S. market. Max noted, “Our approach to crafting conversational emails led to reply rates that many of my peers thought were unattainable.” This success was a direct result of Smartlead's capabilities and the agency’s focus on engaging prospects meaningfully.
  • Enhanced Email Deliverability and Reputation: The shift to Smartlead not only improved email deliverability but also bolstered the agency's email reputation. By avoiding the traditional direct-pitch methods and instead starting conversations, Max’s team achieved better results in terms of email engagement.
  • Higher Conversion Rates: The conversational email strategy significantly outperformed traditional direct-pitch tactics. Max highlighted, “Starting conversations through email is crucial. Many lead generation agencies overlook this, but it’s key to guiding prospects effectively through the sales funnel.” This approach led to up to 10 times more revenue for their clients compared to other agencies.

Next Steps With Smartlead

As Halfwarm looks to the future, Max plans to leverage Smartlead’s robust features to further scale his agency's operations. He is optimistic about the ongoing enhancements and potential new capabilities that Smartlead will bring. Max envisions these advancements playing a crucial role in his agency’s growth strategy, helping to refine and expand their outbound marketing efforts.

Max is enthusiastic about continuing to share his experiences and success with the broader Smartlead community. By contributing insights and strategies, he aims to help others in the community achieve similar remarkable results. His commitment to supporting and engaging with fellow users reflects his belief in the value and potential of Smartlead.

If you’re interested in seeing how Smartlead can transform your outbound marketing efforts, we invite you to start with our free trial. Experience firsthand the benefits and capabilities that can elevate your marketing strategies and drive success for your business.

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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.