Built by Deliverability EngineersBuilt by Deliverability Engineers Who've Sent 50M+ Cold Emails
We watched too many sales teams burn domains, land in spam, and waste hours on manual follow-ups. So we built ColdBox — the cold email platform that 2,000+ B2B teams trust to hit the primary inbox at scale and book meetings on autopilot.
Our CEOWhy We Built ColdBox
“I spent five years running outbound for SaaS companies. Every tool I tried either killed my domain reputation or couldn't scale past 200 emails a day. So I assembled a team of deliverability engineers and we built the platform we always wished existed — one where 95%+ of your emails actually land in the primary inbox, AI handles replies and books meetings for you, and you never have to think about warmup again. That's ColdBox.”
Our WorkflowWe kept losing deals to the spam folder. So we fixed it.
Our founding team ran outbound at three different SaaS companies. Same story every time: 55% of emails hitting spam, hours wasted on manual warmup, and five different tools duct-taped together. We built ColdBox to replace all of it with one platform that actually works.
Why UsTrusted by 2,000+ Sales Teams Worldwide
Average Deliverability Rate
Trusted by users
Average Open Rate Increase
As Featured In
TechCrunch
“While most cold email tools bolt on AI as an afterthought, ColdBox built its reply agents from scratch on top of its deliverability engine. The result: emails that actually land, and AI that actually books meetings.”
March 2026
Forbes
“We tested ColdBox's warmup engine against 6 competitors over 90 days. ColdBox hit 95% inbox placement in 14 days — the next closest took 35 days and plateaued at 78%.”
February 2026
G2 Crowd
“Rated #1 in Cold Email Software with a 4.8/5 average across 500+ verified reviews. Users cite deliverability, AI agents, and customer support as the top reasons they switched to ColdBox.”
Q1 2026
Our MissionYour sales team should close deals, not fight spam filters
We built ColdBox so a 3-person startup can run outbound like a Fortune 500 sales org. Enterprise-grade deliverability, AI personalization, and automated meeting booking — without the enterprise price tag or a team of SDRs.
95%+ Inbox Placement — Guaranteed
Every feature we ship is tested against one metric: does it help your emails land in the primary inbox? Our users average 95%+ placement vs. the 45% industry average.
AI Reply Agents That Book Meetings for You
Your team closes deals. Our AI handles everything else — warmup, personalized follow-ups, objection handling, and calendar booking. Reps using ColdBox save 15+ hours per week.
Scale from 100 to 10,000 Emails/Day — Safely
Most platforms break at scale. ColdBox was engineered for it. Send thousands of personalized emails daily across unlimited accounts without burning a single domain.
Core ValueCore values guide everything we build
We believe that ethical, data-driven outreach is the only way to build sustainable growth and meaningful connections.
Customer Success
Your pipeline is our priority. We offer 24/7 personalized support and resources designed to help you launch successful campaigns from day one.
Transparency
We provide full, real-time reporting on deliverability and performance, giving you clear visibility into exactly what’s working and what’s not.
Efficiency
We obsess over automation, ensuring our software saves you time on setup, execution, and list management, maximizing your team’s ROI.
Innovation
The cold outreach landscape constantly changes. We use AI and machine learning to stay ahead, guaranteeing our users the best deliverability and personalization technology.
Our JourneyFrom broken inboxes to 50M+ emails delivered
Every milestone measured by one thing: did our customers book more meetings and close more deals?
Born from a Broken Inbox
Our founders were running outbound for 3 SaaS companies — and losing 55% of emails to spam. They quit their jobs to fix cold email deliverability from the ground up.
Deliverability Engine Built
The core warmup system and email infrastructure go live. Internal testing hits 96% inbox placement across Gmail, Outlook, and Yahoo — before a single customer signs up.
First 100 Teams — 95%+ Inbox Rate
ColdBox opens to early adopters. Within 60 days, 100 sales teams connect their accounts and collectively send 1M+ emails with a 95%+ primary inbox rate.
AI Reply Agents Launch — 3x More Meetings Booked
We ship AI Reply Agent and AI Sales Agent. Beta users report 3x more meetings booked per week as the AI handles follow-ups, objections, and calendar scheduling automatically.
2,000+ Teams — 50M Emails Sent
ColdBox crosses 2,000 active sales teams and 50M total emails sent through the platform. Unified Inbox and advanced A/B testing launch to general availability.
Enterprise-Ready — CRM Integrations & CASA Certified
CASA (Cloud Application Security Assessment) certification achieved. Native integrations with HubSpot, Salesforce, and Pipedrive go live. Enterprise customers managing 500+ sending accounts join the platform.
By the NumbersResults that speak louder than promises
These aren't vanity metrics. Every number here ties directly to more pipeline and more closed deals for our customers.
Cold Emails Delivered
Sent through ColdBox and landed in the primary inbox — not spam
Inbox Placement Rate
vs. the 45% industry average — that's 2x more emails actually seen by prospects
Sales Teams Trust ColdBox
From 2-person startups to 200-seat sales orgs running outbound at scale
Email Accounts Warmed & Managed
Automated warmup keeps every account healthy — zero manual work required
More Meetings Booked
Teams using AI Reply Agents book 3x more meetings than manual follow-up
Saved Per Rep, Per Week
Time your SDRs get back when AI handles warmup, replies, and scheduling
Key BenefitThe Unfair Advantages That Set ColdBox Apart
Automated Warmup — 95%+ Inbox Rate
Our AI warmup engine builds your sender reputation automatically with human-like email patterns. Reach the primary inbox from day one.
A/B Test Everything — Find Winners Fast
Test subject lines, email body, CTAs, and send times with statistically significant results. Stop guessing, start scaling what works.
CASA Certified Data Protection
End-to-end encryption and CASA certification protect every lead. Your data meets the highest cloud application security standards.
Free Expert Support — 24/7
Cold outreach strategists available around the clock on every plan. Get campaign audits, deliverability help, and proven playbooks at no extra cost.
Team MemberMeet our leadership team
The passionate experts behind ColdBox who are dedicated to helping sales teams close more deals with AI-powered outreach.
Erik Parker
Project Manager
Prady Jonson
CO Founder
Jackson Tom
Operations Manager
Amber Arnessia
Product Manager
Alex Robert
UI/UX Designer
Josh Romison
Data Analyst