About Sentinel’s Reach
We’re a cold email infrastructure agency built by outbound practitioners — not marketers.
WHO ARE WE
Sentinel’s Reach is a cold email infrastructure agency based in Australia, serving B2B businesses across the United States. We build and manage the complete technical outbound system — the domains, the warmup, the data, the sequences — so businesses can reach their ideal clients directly without depending on ads, algorithms, or referrals.
We work with a small number of clients at a time deliberately. Every setup we build is done from scratch, configured specifically for your ICP, and maintained continuously. No cookie-cutter templates. No subcontractors.
OUR MISSION
Cold email is one of the most direct and cost-effective ways to reach decision-makers. But most businesses either don’t have the technical knowledge to set it up properly or don’t have the time to manage it. We exist to close that gap — building outbound systems that actually reach inboxes, generate replies, and create real pipeline
WHAT WE DO
- Sending domain setup & DNS configuration
- Inbox provisioning & continuous warmup
- ICP-matched prospect list building
- Sequence copywriting & A/B testing
- Campaign management & deliverability monitoring
- Monthly performance reporting
How We Work
Discovery
We start with a 60-minute onboarding call. We learn your ICP, your offer, your existing outreach history, and what you’ve tried before. Everything we build starts here.
Infrastructure
We purchase and configure your sending domains, provision your mailboxes across Google Workspace and Microsoft 365, and set up full DNS authentication — SPF, DKIM, and DMARC.
Warmup
Every inbox runs through a structured warmup period before a single campaign email goes out. We monitor deliverability daily and don’t launch until placement is above 90%.
Data
We build your prospect list using Apollo, filtered precisely to your ICP. Every contact is verified through Million Verifier before entering any sequence. Bounce rate stays under 2%.
Launch
We write your email sequences, load them into Smartlead, and launch with a controlled ramp-up. Open rates, reply rates, and domain health are monitored from day one.
Optimise
Every week we analyse reply data, rewrite underperforming emails, refresh contact lists, and report back. The system compounds — it gets better the longer it runs.
Ready to build your outbound system?
We take on a limited number of new clients each month to maintain quality.
