Calvin Wiltermood on Scaling with Smartlead: Closed $700K+ ARR for His Agency

Key Highlights

• Closed +$700K ARR for their business in competitive spaces
• 33% Positive Reply Rate for a 13,000 prospects campaign
• 5x efficiency with cold emailing

About Calvin Wiltermood

With a strong background in B2B lead generation and a huge passion to help founders bet on themselves, Calvin Wiltermood’s career began in sales, where he worked his way from a Business Development Representative (BDR) to a Team Lead and eventually an Enterprise Account Executive.

After working with several companies, including a SaaS company, Calvin joined as an Advisor for Trailway Growth, focusing on automated cold email outreach for B2B clients. 

Calvin’s deep understanding of cold emailing and his hands-on experience with different tools in the market have enabled his agency to scale its outbound processes effectively, reaching clients in diverse industries like SaaS, Tech, and Marketing.

The Challenge

Calvin Wiltermood specializes in helping technical founders (solopreneurs → public companies) build revenue engines. Traditional cold calling was effective but unscalable:

"If I wanted to book a meeting, I needed to spend X hours on the phone. Our clients are accountants, lawyers, salespeople – all in one. They needed something automated."

Before discovering Smartlead, Calvin tried almost every tool in the market but faced several challenges that hindered his ability to scale cold email outreach effectively. Some major challenges included:

Deliverability Issues

Previously used didn’t offer good deliverability and lead to Inbox burnout and monthly deliverability crises.

Inbox Crashing

No agility to pivot during ESP outages (e.g., Outlook inboxing crashes).

Inefficient Client Campaign Management

No unified view and managing 50+ clients with different campaigns and ensuring all inboxes were operating smoothly became increasingly difficult.

Manual Reply Categorization

Without proper tools to manage and categorize replies automatically, Calvin and his team spent too much time on manual tasks.

Why Smartlead?

After testing various cold email tools, Calvin turned to Smartlead for its superior deliverability features, robust API integration, and automation capabilities. 

He was introduced to Smartlead through recommendations from peers in the industry, and after using the platform for a year and a half, he found that it perfectly addressed the needs of his agency.

Key Reasons for Choosing Smartlead:

Multi-Inbox Management at Scale:

• Managed 45,000+ inboxes with instant adjustments during deliverability fires.

Deliverability Safeguards:

• Warming pools with real-time tracking and DNS record checks preempted issues.
• Critical during crises (e.g., October Outlook collapse), where Smartlead’s analytics provided client-facing transparency.

Automation Flexibility:

• Webhooks enabled custom reply-management sequences and CRM syncs.

“We’re barely scratching the surface of what’s possible. It’s a foundation for agency growth.”

Client-Centric Analytics:

• Filtered performance data by client/seat to optimize campaigns individually.

“Smartlead, without a doubt, in my opinion, is the best tool in the market for cold email outreach”.

Solutions Offered by Smartlead

Massive Inbox Scalability

• Managed 45,000+ inboxes with centralized control.
• Enabled instant swaps during deliverability crises (e.g., burned inboxes, ESP outages).

*"When inboxes burned, we fixed it in minutes which was crucial as we were handling this for our 35+ clients."*

Proactive Deliverability Safeguards

• Real-time warming pools to maintain sender reputation.
• DNS record diagnostics to preempt configuration errors.
• Critical during ESP collapses (e.g., Smartlead’s Outlook inboxing data helped pivot strategies mid-crisis).

Automation via Webhooks & API

• Built custom reply-management sequences and CRM syncs.

Client-Specific Analytics

• Filtered performance data per client/seat (e.g., reply rates, positive responses).
• Enabled granular optimizations for diverse campaigns (SaaS vs. blue-collar niches).

Security & Workflow Hygiene

• Restricted inbox deletion to prevent infrastructure sabotage.
• Clear-formatting tool to eliminate email template errors from pasted text.

Results Achieved

After using Smartlead, Calvin experienced remarkable improvements in their cold email campaigns, delivering outstanding results for their clients:

• 33% Positive Reply Rate in a high-volume campaign (13,000 prospects).
• 5x Efficiency vs. Cold Calling with scalable outreach without proportional labor.
• Used Smartlead’s inboxing data to advise clients during ESP outages, building trust.
• More than $700K Closed in ARR for their business in competitive spaces (SaaS, FinTech) and underserved niches.

Why Smartlead Stands Out

Beyond features, Calvin highlights:

Founder-Led Community

Webinars with industry leaders and Slack networking are a major plus point with Smartlead.

Security-First Approach

Restricted inbox deletion prevented catastrophic errors.

Clear Formatting Tools

Clear formatting seems small, but saved them from endless formatting disasters.

Looking Ahead

Trailway continues to leverage Smartlead for its 35+ client roster. Calvin’s wishlist?

• Bulk inbox management requests.
• Extended analytics beyond 30-day windows.
• Daily reply-rate tracking for faster deliverability insights.

“No matter what, I’ll always ask for more data – but Smartlead remains the best in the market.”

Conclusion

By providing robust tools for email deliverability, API integration, and client management, Smartlead has allowed Calvin and his team to scale their outbound efforts, automate follow-ups, and consistently achieve impressive results for clients.

Smartlead empowers agencies and lean teams to scale email outreach with enterprise-grade deliverability.

For agencies looking to scale their outbound efforts, Smartlead provides the tools and infrastructure to succeed. Their 14-day free trial is a good way to start testing the tool for your agency.