B2B Cold Email Agency

Fully managed cold email,
built to last.

We handle . You handle the replies.

Focused cold email lead generation for real results

Our Cold Email Marketing Services

Three Red Boxes handles cold email outreach from start to finish. Infrastructure, targeting, content. All three pillars, working together.

Fully Managed Cold Email Outreach

We take it off your plate. That means building infrastructure that lands, targeting the right people, writing emails that sound human, managing the sends, and optimizing based on what actually works. You close deals. We get you in front of people worth talking to.

Deliverability Diagnostic

Already sending and landing in spam? We figure out why. Full audit of your domains, DNS, authentication, reputation, and inbox placement. You get clear answers on what's broken and a roadmap to fix it.

The Three Pillars

Cold Email Marketing

Infrastructure

Domains, inboxes, DNS, warmup, rotation. We build and maintain the foundation that keeps you out of spam and in the inbox.

Targeting

We find the right people. Verified contacts, accurate data, segmented lists built around your ideal customer profile.

Content

Cold email that sounds human. We write, test, and refine messaging that gets replies.

How Our Cold Email Agency Works

Phase 1 Build

The Foundation Everything Sits On

We start with infrastructure. Dedicated domains, DNS authentication, mailboxes, and warming. This takes 1-2 days to build and 30 days to warm properly. There's no shortcut here that doesn't cost you later.

Phase 2 Strategy

Who Actually Wants What You're Selling?

While infrastructure warms, we dig into strategy. What's the offer? How many people in the world actually want it? That's your TAM. From there we narrow to your ICP and build the targeting that makes outreach work.

Phase 3 Launch

Campaigns That Sound Human

With infrastructure ready and targeting dialed in, we launch. That means copy that sounds like a real person wrote it, not AI or marketing fluff. Careful ramp-up. Sustainable sending.

Phase 4 Optimize

Refine Based on Real Data

Campaigns don't end at launch. We monitor performance, test messaging, and maintain deliverability. Ongoing refinement based on what's actually working.

Why Choose Our Cold Email Agency

Our Philosophy

Cold email isn't about blasting strangers and hoping someone bites. It's about starting relationships. Getting your foot in the door with the right people. Everything we do is built around that.

Built to Last

We don't burn domains for quick wins. Our infrastructure is designed for long-term, sustainable outreach that won't crater your sender reputation.

Fully Managed Cold Email

You don't need to learn cold email. We handle everything: infrastructure, targeting, content, optimization. You just show up for the meetings.

Deliverability Obsessed

Anyone can send emails. Getting them into inboxes is the hard part. We've built our entire approach around deliverability because none of it matters if you're not in the inbox.

Real Results

We focus on replies that turn into revenue. Not vanity metrics. Not open rates. Actual conversations with qualified prospects who want to talk.

What Clients Say

"Three Red Boxes has been outstanding at executing our cold email outreach campaigns. They are detail-oriented, always on schedule, and extremely knowledgeable about current best practices for email deliverability, which has made a measurable difference in our campaigns. Their clear communication and ability to launch and manage campaigns efficiently make them a team I highly recommend."

Cristine Platt Dewey

Managing Director, ROCO Educational

"Three Red Boxes built, launched and manages our now successful email outreach campaign after a long, rigorous selection and development process. These are much harder to do than first expected, and Three Red Boxes really understands what is important to a small business email outreach campaign. One of many great things about them is that they do not use vanity metrics which is what most outreach campaign partners rely on.

Three Red Boxes is the team that got our system off the launch pad and generating revenue, evolving a fragile concept into a high performance machine that now runs with consistency, scale, and reliability. Very strong recommendation for Three Red Boxes."

Neil Reid

Founder and Principal, Grants For You

Frequently Asked Questions About Cold Email Services

How does pricing work?
We work on monthly project fees depending on your needs and campaign volume. Book a consultation and we'll put together a custom proposal.
How do you make sure emails land in the inbox?
Infrastructure first. Mailboxes created for cold email. Proper DNS authentication, dedicated sending domains, gradual mailbox warming. Then sustainable sending practices and continuous monitoring. Without this foundation, nothing else works.
How quickly will I see results?
Infrastructure and warming takes about 30 days. After that, most clients see initial results within the first month of active sending. Full optimization usually takes two to three months… sometimes more.
How many emails can you send per month?
Volume depends on the infrastructure we build. Infrastructures can be built for any scale. But the real question is how many people actually want what you're selling. We build campaigns around your TAM, not arbitrary volume targets.
How do you build email lists?
Multiple data sources matched to your ideal customer profile. Every list goes through verification before sending. List quality matters more than list size.
What makes Three Red Boxes different?
Three pillars working together: infrastructure, targeting, content. Most agencies optimize for one and hope the others follow. We build campaigns where all three support each other.
Do you work with any industry?
We specialize in B2B. If you're selling to businesses and have a clear ICP, we can likely help. We'll tell you upfront if we're not the right fit.
Do you handle responses?
No. We're not salespeople and we're not experts in your field. You are. When replies come in, we have systems that notify you or forward them to a mailbox of your choice. From there, you take the conversation.
Is cold email legal?
Yes, when done correctly. CAN-SPAM requires accurate sender information and clear opt-out mechanisms. Our cold email services are built with compliance in mind.

Ready to Book More Meetings?

Let's talk about what cold email can do for your business.