Case Study: How a Marketing Agency Closed 3 Retainers in 30 Days With Cold Email
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Case Study: How a Marketing Agency Closed 3 Retainers in 30 Days With Cold Email

A 6-person digital marketing agency with zero outbound infrastructure built a cold email system from scratch and closed three new retainer clients in their first month.

ART
AI Research Team
December 07, 2025
6 min read

The Starting Point

Grove Digital is a six-person marketing agency based in Austin, Texas, specializing in paid media and SEO for e-commerce brands. Their growth had relied entirely on referrals. When referrals slowed in Q3 2024, they had no outbound engine to fall back on.

They came to us with a clear goal: generate five qualified discovery calls per month from cold outreach. Budget: $1,500/month for tools and infrastructure.

The Setup

Target ICP: Direct-to-consumer e-commerce brands doing $2M–$20M in annual revenue, with active paid media spend but no dedicated agency relationship.

Toolstack:

  • Apollo.io for prospecting (filtered by revenue, headcount, tech stack showing Meta Ads and Google Ads pixels)
  • Instantly.ai for email sending
  • Two dedicated sending domains (not their primary domain)
  • Mailreach for warm-up

List building:** 300 accounts per month, 2 contacts per account (founder + head of marketing where available). Total: ~600 contacts per month.

The Email Sequence

They ran a 4-step sequence over 14 days:

  1. Day 1: Personalized opener referencing a specific product or ad creative they had seen from the prospect's brand, followed by a single question about their current paid media performance
  2. Day 4: Value-add email sharing a relevant case study from a similar brand
  3. Day 8: Short follow-up referencing the previous email, different angle
  4. Day 14: Break-up email with a low-friction CTA

Subject lines that worked:

  • "[Brand] — saw your Meta ads"
  • "quick question about your ROAS"
  • "idea for [Brand]"

Results (Month 1)

  • 600 contacts emailed
  • 47% open rate
  • 8.3% reply rate (50 replies)
  • 11 discovery calls booked
  • 3 new retainers signed (average value: $4,500/month)

Total new MRR from month one: $13,500 — a 9x return on their tool investment.

What Made the Difference

Hyper-specific targeting. Filtering for brands with active ad spend meant every prospect was a real potential buyer, not just a company that might theoretically need marketing services.

Personalization at the first line. Referencing a specific ad creative or product they had researched made the email feel far more human than typical agency outreach.

Low-friction CTA. They did not ask for a 30-minute call in the first email. They asked one relevant question. Replies led naturally to calls.

Month 2 Iteration

They added a LinkedIn touchpoint between email steps 2 and 3, sending a short voice note on LinkedIn to the same prospects. Call bookings increased by 40% the following month.

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