How StoneHaven Built a $38M+ Defense Pipeline on a 120,000-Email-a-Month Outbound Engine

In six months, StoneHaven turned a defense supplier's incumbency-capped sales motion into a predictable engine that surfaced 85+ qualified program opportunities and $38M+ in tracked pipeline. Before that, growth was hostage to existing relationships: new programs were out of reach, procurement channels crawled, and the team had almost no line of sight into the program offices that controlled the budget.

$38M+  |  85+  |  1.6x  |  30% faster

• $38M+ in tracked defense pipeline secured
• 85+ qualified program and prime-contractor opportunities
• 1.6x average contract value ($1.5M to $2.4M, a 60% jump)
• 30% faster RFP cycle (27 months down to 19)

The company

A mid-sized US defense technology supplier (roughly 120 employees) selling capability solutions into Department of Defense program offices and Tier-1 and Tier-2 prime contractors across defense and national security programs.

The product was trusted and mission-proven. The pipeline was not. Growth depended on existing relationships and renewals, which capped both the size and the number of deals the team could chase.

The challenge: locked out of new programs

Every dollar of growth came from incumbency. That meant smaller, defensive renewals (average targeted contract value sat at $1.5M) and almost no path into the larger, newer programs where the real budget lived.

Procurement channels were slow, and the team had thin visibility with the program offices and acquisition officers who actually shape requirements. Sales cycles stretched to 27 months on average. The little outbound that did happen went out from the company's primary domain, putting sender reputation and brand on the line in a sector where reputation is the whole game.

The team did not need more activity. It needed reliable, professional-grade access to people it could not reach.

The process: a deliverability-first outbound engine

StoneHaven built the system in six layers. The goal was access at scale that never put the client's reputation at risk.

1. Infrastructure and deliverability

StoneHaven moved all cold sending off the client's primary domain and onto 46 dedicated outreach domains with isolated reputation. Across them sat 610 inboxes on a diversified stack: official IP pools from two major enterprise mail providers, plus dedicated per-client SMTP IPs. No shared IPs anywhere, so no outside sender could touch the client's reputation.

SPF, DKIM, and DMARC were configured and verified on every domain before a single email went out. Inbox placement held at 98% across the entire engagement.

2. Channel matched to audience

Volume was split on a 50/30/20 model so each segment got the infrastructure it warranted:

3. Targeting and list strategy

Outreach was mapped to specific program offices and prime contractors, then segmented by capability gap, program phase, and compliance posture. The defense TAM is tight, so lists were re-hit every 90 days with fresh angles instead of being burned through in a single pass.

4. Copy built for defense buyers and for the inbox

Messages were plain-text and written like an SMS, with spintax keeping each send unique. Angles centered on capability gaps, operational readiness, and compliance requirements, backed by case studies showing mission-critical performance.

5. Cadence and reply handling

Sequences stopped after 5-7 touches. Between 50% and 70% of meetings came from steps 2-4 in the thread. Qualification gates mapped straight to defense procurement: an opportunity only counted as qualified if it tied to a funded program, the right acquisition authority, and an active or near-term RFP pathway. Everything else was routed or dropped.

6. Warmup and domain rotation

Every inbox was warmed before its first cold send. At 120,000 emails per month, 10-20% of domains burn monthly. StoneHaven held a 20-25% warmed domain reserve, so any burned domain was swapped in within 1-3 days with zero sending downtime.

The results

StoneHaven ran the engine at a steady 120,000 emails a month and converted access into pipeline.

• $38M+ in tracked defense pipeline secured across 16 advanced pursuits averaging $2.4M each.
• 85+ qualified program and prime-contractor opportunities cleared the bar, out of roughly 1,900 positive replies.
• 720,000 cold emails sent over six months at a steady 120,000 per month.
• 2.5% reply rate, well above the sub-1% norm for cold defense outreach.
• Average targeted contract value rose from $1.5M to $2.4M, a 1.6x (60%) increase.
• Average RFP cycle shortened from 27 months to 19 months, about 30% faster.
• 98% inbox placement held across all 46 outreach domains while the client's primary domain stayed clean.

Beyond the numbers

Growth stopped depending on who the team already knew. The capture team now spends its time on qualified pursuits instead of cold prospecting, with steady visibility into program offices that used to be unreachable. Incumbency became one channel among several rather than the ceiling on the whole business.

Methodology

Figures are drawn from real client engagement data, anonymized for confidentiality and defense-sector sensitivity. Numbers reflect a six-month engagement at a steady-state sending volume of roughly 120,000 cold emails per month across 610 inboxes and 46 dedicated outreach domains.

FAQ

How fast did qualified opportunities start coming in?

First qualified program opportunities landed within about 3-4 weeks of go-live, once warmup completed and sequences activated. Meaningful tracked pipeline built through months 2 and 3.

Does high-volume outbound actually work for defense and regulated sales?

Yes, when volume is tuned to a tight TAM and re-hit every 90 days with fresh angles. Deliverability and precise targeting matter far more than raw blasting. The 120,000-a-month engine was paced, warmed, and segmented at every step.

How was the client's main domain protected?

All cold sending ran on 46 dedicated outreach domains with isolated reputation. The company's primary domain was never used for cold outreach, so brand and sender reputation stayed intact.

What kept deliverability at 98%?

A diversified 50/30/20 stack on official enterprise- and premium-provider IP pools plus dedicated SMTP IPs, automated SPF, DKIM, and DMARC verified before sending, strict warmup on trusted pools, and domain rotation from a 20-25% warmed reserve.

What does a setup like this run at?

Around 120,000 emails per month across roughly 610 inboxes and 46 domains.