How Mailchimp Grew from a Side Project to a $12 Billion Acquisition

Discover the key strategies that turned Mailchimp from a small side project into a $12 billion success, and how you can apply them to your own startup.
Kieran Audsley
8 min read

1. Mailchimp’s Humble Beginnings

Mailchimp’s journey began with a clear mission: solving a small, specific problem for businesses. Founded by Ben Chestnut and Dan Kurzius, the duo initially worked under the name Rocket Science Group, offering web design and development services. Their pivot to email marketing emerged from client feedback, as small businesses struggled with managing email campaigns effectively. In response, Chestnut and Kurzius built Mailchimp as an intuitive tool that allowed even the smallest entrepreneurs to run successful email marketing campaigns.

The name “Mailchimp” was born from their desire for something memorable and quirky, reflecting the friendly, accessible nature of the tool. They even leaned into a playful branding approach with the chimp mascot, a decision that resonated with their target audience: small business owners looking for approachable, no-fuss solutions.

Key Takeaways for Entrepreneurs:

  • Identify and Solve Specific Problems:
    Mailchimp's success came from its founders’ ability to identify a gap in the market and provide a simple, effective solution for small businesses.
  • Embrace Feedback:
    Customer-driven innovation was at the heart of Mailchimp’s evolution. Listen to your audience and adapt based on their needs.

Could Mailchimp have scaled without listening to customer feedback? How did their quirky branding choice help them connect with their market? These early decisions were critical in laying the foundation for Mailchimp’s eventual rise.

2. The Decision to Bootstrap

In a world where venture capital (VC) funding is often seen as a crucial step in scaling a business, Mailchimp’s decision to bootstrap was a bold move that set them apart from the competition. Instead of seeking external investors, founders Ben Chestnut and Dan Kurzius chose to rely on their own resources, reinvesting profits back into the business to fuel sustainable growth. This choice allowed them to retain full control over the direction of their company, without the pressure of answering to investors with differing priorities.

The decision to reject VC funding was rooted in their commitment to building a business that would thrive at its own pace, without the need for rapid scaling or sacrificing their core mission. Unlike competitors who aggressively pursued venture capital for fast expansion, Mailchimp’s focus on steady, customer-driven growth paid off.

Key Takeaways for Entrepreneurs:

  • Bootstrapping Offers Control:
    By choosing to self-fund, Mailchimp maintained control over decision-making, ensuring that every move was in alignment with their vision.
  • Sustainable Growth Model:
    Reinvesting profits instead of scaling too quickly allowed the company to build solid foundations for long-term success.
  • Avoiding the Pitfalls of VC Pressure:
    For many startups, the temptation of VC funding can lead to an unsustainable growth trajectory. Mailchimp’s steady approach proved that sustainable growth can be more rewarding in the long run.

Could bootstrapping be a better alternative to VC funding for your startup? How can you scale effectively without external pressure? Mailchimp’s decision to grow at their own pace proves that steady, self-sustained growth can be the key to long-term success.

3. Evolution Through Customer-Centric Innovation

One of the most powerful strategies that Mailchimp used to evolve from a small side project into a $12 billion company was its relentless focus on customer feedback. From the very beginning, the founders understood that the key to building a scalable business was not just about offering a product, but about continuously improving that product based on what users needed. Mailchimp’s success was driven by their commitment to innovation through customer-centric features, and this approach helped them stay ahead of competitors in the ever-changing digital marketing space.

By listening to their customers, Mailchimp was able to rapidly iterate and expand beyond its initial email marketing offerings. What started as a simple email tool for small businesses quickly evolved into a full-fledged marketing platform that included:

  • Email Automation:
    Allowing users to set up automatic email campaigns, saving time and increasing efficiency.
  • Landing Pages:
    Helping users create tailored landing pages to increase conversions.
  • Advanced Analytics:
    Providing deeper insights into campaign performance, helping businesses optimize their marketing efforts.

This customer-centric evolution not only helped Mailchimp stay relevant but also gave small businesses the tools they needed to grow. By consistently prioritizing the needs of their users, Mailchimp transformed itself from a basic email service provider into a comprehensive marketing powerhouse.

Key Takeaways for Entrepreneurs:

  • Innovation Starts with Customers:
    Listening to your users and adapting your product to meet their needs can help you stay ahead of competitors.
  • Iterative Development is Key:
    Regularly updating your offering based on feedback ensures that your product remains valuable and relevant.
  • Expanding Beyond the Core Offering:
    As your business grows, don’t be afraid to expand your product or service range to address new customer needs.

Could your business benefit from regularly gathering and acting on customer feedback? How can you ensure your products evolve with the market to stay competitive? Mailchimp’s commitment to customer-centric innovation is a model for any entrepreneur looking to build a business that adapts and thrives over time.

4. Culture and Values Driving Success

The culture at Mailchimp has always been a key driver of its success. From the very beginning, Ben Chestnut and Dan Kurzius wanted to create a company that not only thrived in the competitive email marketing industry but also fostered an environment where employees felt empowered and motivated. This unique company culture, deeply rooted in creativity, collaboration, and inclusivity, played a significant role in Mailchimp’s ability to innovate and scale.

What’s clear is that Mailchimp didn’t just build a business; they built a team-first environment where values drove every aspect of decision-making. Some of the core values that helped shape the company’s culture include:

  • Creativity and Collaboration:
    Mailchimp encouraged its employees to think outside the box, prioritize creative problem-solving, and work collaboratively to come up with innovative solutions. This openness allowed the team to stay agile and ahead of the curve.
  • Commitment to Diversity and Inclusion:
    Diversity was a key factor in Mailchimp’s growth. With employees from diverse backgrounds, Mailchimp embraced different perspectives, leading to more innovative ideas and solutions.
  • Corporate Citizenship:
    Giving back to the community was also an important part of Mailchimp’s ethos. The company supported non-profits and small businesses, reflecting its mission to empower the underdog and make a positive impact in the world.

For entrepreneurs looking to build their own business, Mailchimp’s success proves that your company's culture can be just as important as your product. When your team feels aligned with the company’s mission and values, they are more likely to contribute to the long-term success of the business.

Key Insights:

  • Align Company Values with Customer Needs:
    A strong company culture can attract and retain top talent while also building trust with customers.
  • Foster Creativity:
    Encourage your team to innovate by creating a collaborative and inclusive work environment.
  • Give Back:
    Supporting your community and customers helps build goodwill and strengthens your brand.

How can you build a company culture that drives success? Are your values aligned with the needs of your customers? By creating a culture of collaboration, creativity, and inclusivity, Mailchimp demonstrated that strong internal values lead to business success that transcends product offerings.

5. The Game-Changing Acquisition by Intuit

Mailchimp's acquisition by Intuit for $12 billion in 2021 marked a major milestone in its journey, but it wasn’t just the sheer financial value that made this deal noteworthy. It represented the culmination of years of hard work, strategic innovation, and staying true to their core mission. Intuit, known for products like QuickBooks and TurboTax, saw immense value in Mailchimp's customer-first approach and its ability to scale sustainably, even without venture capital funding. This alignment of values and goals was a key reason why the acquisition was a game-changer for both companies.

So, why did Intuit acquire Mailchimp, and how did it work out for both parties? The deal wasn’t just about gaining a powerful marketing platform; it was about integrating Mailchimp’s unique customer base and expanding Intuit’s offerings for small businesses. By acquiring Mailchimp, Intuit was able to provide small business owners with more tools to manage their business operations—everything from marketing automation to customer relationship management (CRM).

Here are a few key takeaways for entrepreneurs from this acquisition:

  • Strategic Fit Matters:
    When seeking partners, acquisitions, or collaborations, always ensure there’s a strong alignment between your company's mission, values, and your partner’s goals.
  • Positioning for Growth:
    Even if you’re a small player in your industry, staying true to your vision can make your company an attractive acquisition target.
  • Retain Your Core Identity:
    Intuit’s willingness to preserve Mailchimp’s mission of empowering small businesses while expanding its product suite shows that growth doesn’t have to come at the cost of your company’s values.

This acquisition exemplifies the idea that success doesn’t always mean doing everything on your own—it’s about building the right product and finding the right partner at the right time. Entrepreneurs, take note: the growth of your company might not just come from scaling yourself but also from aligning with the right acquisition or partnership opportunities.

Key Insights:

  • Acquisitions Can Strengthen Growth:
    Partnering with larger companies can accelerate your growth if there’s an alignment in values and goals.
  • Maintain Core Mission Post-Acquisition:
    Preserving your company’s identity after being acquired can ensure continued success.
  • Building Scalable, Valuable Products:
    Focus on developing products or services that have inherent value for potential acquirers or partners.

Looking to position your business for growth? What steps can you take to attract larger partners or even prepare for a potential acquisition? By aligning with companies like Intuit, Mailchimp demonstrated how staying true to your values can open doors to massive opportunities.

6. Lessons for Entrepreneurs

Mailchimp’s rise from a side project to a billion-dollar acquisition offers invaluable lessons for entrepreneurs. Whether you're in the early stages of your business or scaling up, the story of Mailchimp emphasizes that success doesn’t come from quick fixes or shortcuts—it comes from a deep understanding of your market, a commitment to your mission, and the willingness to adapt and evolve.

Here are key takeaways for entrepreneurs looking to build a sustainable business:

  • Bootstrapping as a Viable Option:
    While venture capital might seem like the only way to scale, Mailchimp’s success shows that bootstrapping is not only possible but often preferable. By avoiding the pressures of external investors, Mailchimp maintained control over its vision, allowing for more calculated, customer-driven decisions.
  • Customer-Centric Strategy:
    Mailchimp's success was built on listening closely to its customers and adapting to their evolving needs. Entrepreneurs should always prioritize their customers' feedback and use it to shape their product or service offerings. This approach can differentiate your business in crowded markets and create loyal customers.
  • The Power of Perseverance:
    Success rarely happens overnight. Mailchimp’s founders, Ben Chestnut and Dan Kurzius, stuck with their vision for years, even when the growth was slow. Entrepreneurs must remain patient and committed to their long-term goals, especially when early results don’t reflect their ultimate potential.
  • Iterative Development:
    Mailchimp didn’t just create an email marketing tool—it built a dynamic platform that evolved with its customers’ needs. Entrepreneurs should focus on iterative development, continuously improving their products and services based on feedback and new opportunities. This mindset leads to long-term growth and innovation.
  • Sustainable Growth Over Rapid Scaling:
    Mailchimp chose to grow steadily by reinvesting profits rather than chasing rapid, unsustainable growth. This strategic decision allowed them to maintain a strong customer-first ethos, which proved to be a key factor in their long-term success.

Mailchimp’s journey is a blueprint for entrepreneurs who want to scale sustainably while keeping their values intact. Instead of focusing on fast growth, look to create a solid foundation built on customer relationships, smart growth strategies, and a focus on the long term. By following these lessons, you can achieve lasting success and avoid the common pitfalls many startups face.

Are you ready to take your business to the next level? Founderli’s services, like our Idea Tester and Full Launch Plans, can help you build a strong, sustainable business just like Mailchimp.

Kieran Audsley
Founderli CEO, Founder