Case Study

How Rock Solid Generated 1,000 Positive Responses: A Case Study

Sattwik Das
10
Min
Published On
This is some text inside of a div block.
Updated On :
February 24, 2026
Recreated On:
This is some text inside of a div block.

Heading

This is some text inside of a div block.
Min
Created On:
This is some text inside of a div block.
Updated On:
This is some text inside of a div block.

Over 90% of marketers reveal that lead generation is their utmost priority. Johannes Fessler, a lead generation expert and the owner of Rock Solid, an agency for generating leads for marketplaces, faced many challenges in his initial days while generating leads for his clients. 

With his enthusiasm, agile mindset, and testing of different methods and software, Johannes skillfully scaled his business with Smartlead. In this case study, Johannes shares his experiences, strategies, and the transformative impact Smartlead had on his business's success.

How It All Started: The Journey of Johannes Fessler and Rock Solid

Johannes Fessler, originally from Germany and living in the south of Spain, began his career working on cruise ships. Leveraging his strong communication skills and entrepreneurial spirit, he soon ventured into lead generation

His initial job was to cold call for e-commerce events, targeting prospects from renowned brands like IKEA, Adidas, and Nike. Facing resistance and low response rates, Johannes remained determined to succeed in this competitive field, and soon he found out about the effectiveness of cold emailing. 

Upon integrating Smartlead into his workflow, Johannes experienced a significant improvement in his lead generation efforts. The tool's advanced features and intuitive interface empowered him to automate tasks, track leads efficiently, and optimize his outreach campaigns effectively. 

Soon after, Johannes transitioned from freelancing to agency ownership, specializing in lead generation for online e-commerce marketplaces. This allowed him to scale his operations and expand his client base while maintaining a sharp focus on delivering exceptional results.

With Smartlead as his trusted ally, Rock Solid flourished, securing partnerships with industry giants like Allegro and Dr. Cialdini. 

As Johannes reflects on his journey from freelancer to agency owner, he fondly acknowledges the role Smartlead played in his success story. 

Challenges Faced Along the Way

Johannes was initially assigned to cold-call high-ticket prospects as a freelancer. He tried cold-calling high-profile clients for e-commerce events, but he faced significantly lower response rates. Johannes also found out that traditional cold-calling methods are time-consuming and inefficient.

Along the way, when he scaled his operations and transitioned into building an agency, Johannes faced multiple roadblocks along the way while generating leads and booking meetings for his clients. 

Johannes started cold email outreach by sending bulk emails from multiple domains, which raised concerns about email deliverability and fair sending practices. Soon he faced technical challenges with email disconnections and domain issues, which significantly affected his outreach efforts.

Moreover, Johannes noticed industry-wide challenges—low success rates for cold email outreach, high turnover rates among sales development representatives (SDRs), and the prioritization of email deliverability and personalization.

As Rock Solid grew over time, Johannes also faced difficulties scaling his lead generation efforts while maintaining high response rates and personalized communication with potential clients.

Read more: How to Send 10,000 cold emails with Smartlead

Notable Achievements of Rock Solid

Remembering his first client, Johannes mentioned that he achieved a 61% positive reply rate with absolutely no personalization in his cold emails. However, with personalization, he now achieves an outstanding positive reply rate of 89.89% with his email outreach campaigns through Smartlead.

Leveraging Smartlead’s personalization, Johannes booked over 100 meetings and signed 74 clients in just four months.

Rock Solid, using Smartlead, generated 1,000 positive responses from a campaign targeting 52,000 leads.

Moreover, his agency's specialization in online e-commerce marketplaces led to partnerships with industry giants like Allegro (the biggest online e-commerce marketing place of European origin) and Dr. Cialdini, which proves the success of a niche-focused approach.

Key Factors Contributing to Success

Johannes was curious to explore beyond traditional lead-generation methods, such as bulk email outreach, which enabled him to outperform traditional lead-generation techniques.

Johannes did his share of market research and by focusing on online e-commerce marketplaces, positioned his agency as a leader in the underserved market.

Johannes also pointed out Smartlead’s contribution to his success. 

He streamlined lead generation with Smartlead with features such as automated email sequences and lead tracking. By automating his outreach efforts, Johannes could efficiently focus on high-value activities, resulting in closing more deals. 

As a result, Johannes could fill up an event with 200 people in two and a half months almost by himself. 

Smartlead enabled Johannes to personalize his outreach efforts, increasing engagement and response rates. Using dynamic placeholders and personalized messaging, Johannes was able to create customized messages for his target audience, which resulted in a positive response rate of 89.89%

Smartlead's analytics tools provided Johannes with valuable insights into his outreach campaigns. Johannes was able to make data-driven decisions to improve his efforts by analyzing metrics such as open rates, click-through rates, and conversion rates

Expounding on his achievements, Johannes highlighted the remarkable responsiveness of Smartlead's customer support. Prompt and valuable assistance from Smartlead's support team, including its founder, Vaibhav Namburi, personally ensured that Johannes could navigate through blockers and fully leverage the platform's capabilities.

Stressing on Smartlead’s API infrastructure and it’s capability of integrating with other sales and marketing software, Johannes also mentioned the Clay integration with Smartlead. This integration proves to be a game changer as it allows him to build a comprehensive lead generation ecosystem for his agency. 

By leveraging Clay's targeting capabilities and lead nourishment, Johannes was able to focus his efforts on prospects most likely to convert, optimizing the efficiency and effectiveness of his lead generation campaigns. 

Rock Solid: Looking Ahead for Success

Overall, Smartlead's robust features, personalized approach, actionable insights, and dedicated support were instrumental in Johannes' growth as a freelancer and agency owner. By effectively leveraging these capabilities, Johannes achieved remarkable results, establishing himself as a successful entrepreneur in the field of lead generation.

Moving forward, Johannes is determined to push the boundaries of lead generation. His collaboration with Smartlead, active participation in the Agency Velocity community, and successful venture at Rock Solid position him as a thought leader in the field. With plans to further integrate automation and enhance infrastructure, Johannes is optimistic and resolute about positioning himself and his agency as industry leaders.

Table of Content

Share this article

Sattwik Das

Sattwik Das is a Digital Marketing professional at Smartlead, skilled in SEO, SMM, and content creation. He focuses on delivering well-researched, SEO-optimized content that helps businesses enhance their digital presence. Sattwik’s creativity in content marketing and copywriting plays a significant role in boosting business credibility, driving sales, and improving customer engagement.

linkdin-icon

Subscribe to get all our latest blogs

Join us to elevate your outreach!

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

What our customers say

Bojan Najdov

Founder, Lambda Group

“The best outbound email marketing software. Customer support - they are so responsive and helpful Features - you can add multiple email doma”

David Borman

Senior Account Executive, Key Outreach

"Intuitive. Game-Changing. POWERFUL. Analytics, spintax, A/B testing, quick personalization. This is a game changer if you send cold email ca"

Eden Einav

Account Executive, B.I.G. Charity Law Group Professional Corporation

“Hands down the best cold email software. Smartlead is amazing, this is the best tool if you want to cold email at scale and land in the inbo”

Ryane Tully

Co-founder, Pitchlane

“Innovative, reliable, and Suitable For Technical and Non-Technical Users. SmartLead's ability to help me land in the primary inbox and autom”

Romain Osman

Co-Founder, Five Element

“Smartlead is an absolute game-changer! With its exceptional features and support from the Smartlead team, I've experienced remarkable succes”

Reggie B.

Sales Director - Financial Institution Solutions Saggezza, Inc.

“Smartlead is an innovative cold email platform that helps me reach out to potential clients. There are easy-to-use templates, powerful autom”

Nick A.

Founder, Leadbird.io

“I've personally built a sales engagement platform similar to Smartlead, and I am genuinely blown away by the scalability, functionality and”

Mykyta

CEO, Yell Cut

"I can upload hundreds of email accounts, send thousands of cold emails per day, and still have an organized master inbox. This is unseen wit"

Dino Knezovic

Founder, Office Optim

“Smartlead has been extremely helpful with seamlessly onboarding clients, warming up their accounts, and prepping campaigns to send at high v”

Johannes Fessler

CEO, Rock Solid Lead Generation

“Smartlead is absolutely amazing! The software is easy to understand I am not a techie but directly understand everything and if you really h”

René-Karl Lambert

Founder, WindGrowth

“Smartlead is simply amazing. They constantly improve their product and bring new features that make the cold email software even more comple”

Lucas Maliczak

Outbound Lead & Partner, Peakora

“Our campaigns weren't just about reaching out, but reaching out right, and Smartlead helped us achieve this. It has added immense value to o”

Romain Osman

Co-Founder, Five Element

“Smartlead is an absolute game-changer! With its exceptional features and support from the Smartlead team, I've experienced remarkable succes”

Arnold Koci

CEO, Acquisizioneclienti.it

“Best cold outbound email software out there. Everything, is fast, reliable, scalable, you can also white-label, amazing analytics and never”

Cliff Coelho

Owner, Storydriven.video

“I just ended my 2 year search for the right cold emailing platform with Smartlead. A stand alone tool for cold emailing unlike anything else”

David Borman

Senior Account Executive, Key Outreach

“Intuitive. Game-Changing. POWERFUL. Analytics, spintax, A/B testing, quick personalization. This is a game changer if you send cold email campaign. Grateful to this team for building a product that has changed our day to day. 🚀”

Powerful automated workflows that drive sales.

Try Smartlead's AI-led outbound system today.

Frequently asked 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.

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.

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.

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?
+

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?
+

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?
+

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?
+

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?
+

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?
+

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?
+

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.