Case Study

How Levergrowth.io Overcame Deliverability Challenges and Generated $135K in 90 Days with Smartlead

Wajahat Ali
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February 24, 2026
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Key Highlights

  • $135K revenue generated in 90 days for a client.
  • Helped generate a $240,000 Client and 30+ opportunities in 6 months.
  • 36.4% positive reply rate on a major campaign.
  • 121 total replies, proving high engagement and inbox placement.

Client Overview

Isaac Wood, founder of Levergrowth.io, runs an outbound agency specializing in appointment setting and cold email outreach for tech companies, financial services, and professional services. Their primary focus is identifying ideal-fit clients, engaging them through outbound campaigns, and booking sales appointments for their clients.

Levergrowth.io has a strong presence in the United States, Canada, and Europe, where it helps businesses attract, book, and close new clients through cold outreach. Headquartered in Los Angeles, Isaac works closely with West Coast-based companies and understands the evolving landscape of cold email marketing.

Challenges Before Smartlead

Isaac’s first exposure to cold email outreach was as a sales rep at a funded tech startup. With a background in outbound sales and appointment setting, he transitioned into running his own outbound agency. However, as the business scaled, they encountered major challenges that hindered campaign performance:

Deliverability Issues

  • Emails frequently landed in spam or were filtered out, affecting response rates and conversion rates.
  • With Google and Microsoft cracking down on spam, they needed a more sophisticated outbound system to ensure emails reached the inbox.

Managing Multiple Client Campaigns

  • As an agency working with several clients, monitoring inbox placement, warm-ups, and campaign performance was becoming difficult without an advanced platform.

Limited Automation and API Integrations

  • Levergrowth.io used multiple tools to collect data but needed a seamless sending interface with strong API integrations and the Master Inbox for better management.

Why Did Levergrowth.io Choose Smartlead?

Isaac and his team tested several cold email platforms, but Smartlead stood out as the best. They have now been using Smartlead for nearly three years due to its consistent innovation, cutting-edge email deliverability features, and ability to scale outreach campaigns.

Key Reasons for Choosing Smartlead

Industry-Leading Email Deliverability Solutions

Helps emails land in inboxes instead of spam.
Consistent Feature Updates – Smartlead is always ahead of the game with new outbound solutions.

API & Automation 

Seamless data collection, sending interface, and backend systems for campaign optimization.

SmartDelivery for Inbox Placement 

Provides insights into where emails are landing, allowing them to make real-time adjustments.

Master Inbox for Campaign Oversight

A centralized dashboard for managing multiple client accounts at scale.

“We focus on having consistent email deliverability for us and our clients, and Smartlead has consistently helped us achieve that, so it has been a great user experience.”
— Isaac Wood, Founder, Levergrowth.io

How Smartlead Helped Levergrowth.io Scale Outbound Success

1. Overcoming Email Deliverability Bottlenecks

Before Smartlead, email deliverability was the biggest roadblock in their outbound process. With Smartlead’s SmartDelivery, inbox placement tracking, and warm-up features, Levergrowth.io was able to:

  • Improve open and response rates by ensuring emails reach the primary inbox.
  • Optimize sending volume across different providers (GSuite, Outlook, SMTP) to avoid red flags.
  • Rotate inboxes automatically to maintain the sender's reputation and reduce bounce rates.
“Cold email is evolving rapidly, and ESPs like Google and Microsoft enforce stricter spam policies. To stay ahead, you need a better outbound system, and for us, Smartlead has been that system.”

2. Data-Driven Personalization and Targeting

Levergrowth.io uses Clay to build hyper-targeted lists and craft direct, specific messaging. With Smartlead’s automation and personalization tools, they were able to:

  • Improve reply rates by making cold emails more relevant and engaging.
  • Segment and optimize messaging across different industries and personas.
  • Reduce spam complaints by ensuring outreach was highly personalized and valuable.

3. Automating Outreach with API Integrations

Levergrowth.io collects extensive data from various tools and integrates it seamlessly into Smartlead as a sending interface. Using Smartlead’s Master Inbox, they:

  • Automate lead segmentation, email categorization, and response handling.
  • Track campaign performance in real time and make informed decisions.
  • Customize reporting and Slack notifications for better workflow management.
“Our team built backend systems using Smartlead’s API and automation, allowing us to make data-driven decisions and improve our campaigns with real-time insights.”

4. Campaign Results: High Reply Rates & Revenue Growth

Smartlead enabled Levergrowth.io to achieve remarkable results for their clients.

Notable Campaign Successes

  • $135K in revenue generated for a client in just 90 days.
  • Helped generate a $240,000 Client and 30+ opportunities in 6 months.
  • 121 total replies in a campaign(36.4% reply rate).
  • 44 positive replies.

Favorite Smartlead Features & Benefits

SmartDelivery & Inbox Placement Tracking

  • Helped resolve email deliverability issues and scale outbound campaigns efficiently.

API & Automation Integrations

  • Allowed them to build backend systems for efficient campaign execution.

Master Inbox for Multi-Client Management

  • Simplified monitoring, reporting, and lead tracking across multiple accounts.

Seamless Multi-Channel Outreach

  • Enabled email outreach at scale while ensuring consistent inbox placement.

Future Feature Wishlist

Isaac and his team are looking forward to innovations from Smartlead, particularly:

  • Sending volume suggestions based on the provider – to further optimize email-sending limits and prevent domain burnout.

Conclusion

Levergrowth.io has transformed its cold email strategy with Smartlead’s powerful automation, email deliverability optimization, and API capabilities. As the landscape of cold outreach continues to evolve, Smartlead remains the go-to platform for agencies looking to scale efficiently while maintaining high reply rates and revenue growth.

If you’re a business or an agency looking to book meetings at scale, Smartlead is here to help you with scalable cold outbound solutions. You can check our 14-day free trial to get a glimpse of how our solutions can help your business.

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Wajahat Ali

Wajahat Ali is a Technical Content Writer at Smartlead, specializing in the B2B and SaaS sectors. With a talent for simplifying complex concepts, he crafts clear, engaging content that makes intricate topics accessible to both experts and newcomers. Wajahat’s expertise spans across copywriting, social media content, and lead generation, where he consistently delivers valuable, impactful content that resonates with a global audience. His ability to blend technical knowledge with compelling storytelling ensures that every piece of content drives both understanding and results, helping businesses connect with their target markets effectively.

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

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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.