The AI engine that turns cold emails into revenue.
Instantly needed an AI engine that could personalise outreach at massive scale without triggering spam filters. Pinnasys redesigned their AI infrastructure to deliver contextual, high-converting cold email campaigns.
3x
Revenue growth
10x
Deals closed
The Problem
Scaling cold outreach without killing deliverability.
Instantly is a sales engagement platform used by thousands of agencies and sales teams to run cold email campaigns at scale. Their users send millions of emails per day across every industry and geography.
The challenge was that generic email templates were getting flagged as spam, killing open rates and destroying sender reputation. Agencies needed personalisation at scale, but the existing approach — manually customising each email or using basic merge fields — couldn’t keep pace with volume.
Our Approach
We rebuilt the AI engine from the prompt layer up.
Pinnasys worked as an embedded AI partner with Instantly’s engineering team. Rather than bolting on another AI feature, we redesigned the core prompt architecture that powers every email generated on the platform.
The key insight was that deliverability and personalisation are not competing goals — they reinforce each other. Emails that feel genuinely written for the recipient perform better with both spam filters and humans.
We built a contextual prompt engineering system that draws on prospect data — company, role, industry, recent activity — to generate emails that read as if written by a well-researched SDR, not a template engine.
Contextual prompt engineering
Dynamic prompts that adapt based on prospect data, industry context, and campaign goals — generating emails that feel personally written, every time.
AI-powered lead intelligence
The Leads Finder with AI Search lets users discover and qualify prospects using natural language queries, filtering by job title, industry, location, and company size.
Deliverability-first generation
Every AI-generated email passes through deliverability checks — spam trigger analysis, repetition detection, and uniqueness scoring before it’s sent.
Multi-account scale architecture
Built to handle thousands of concurrent campaigns across hundreds of user accounts without performance degradation or repetitive output patterns.
The product in action
From generic templates to an AI-powered revenue engine.
3x
Revenue growth driven by AI-powered outreach
10x
More deals closed through personalised AI campaigns
Millions
Of AI-personalised emails generated daily
Zero
Spam filter degradation — deliverability maintained at scale
Head of Growth — Instantly — Sales Engagement Platform
Services used in this project
.
Three things that made this project work.
Deliverability IS the product
Generating great copy means nothing if it lands in spam. We treated deliverability as a first-class constraint in the prompt architecture, not an afterthought. Every generated email is scored before it sends.
Context beats creativity.
he highest-performing emails weren’t the most clever — they were the most relevant. Pulling in real prospect data (company news, role context, industry pain points) outperformed generic personalisation every time.
Scale demands architecture, not just prompts
When you’re generating millions of emails daily, prompt engineering alone isn’t enough. You need caching layers, output diversity checks, and quality monitoring at infrastructure level.
See how other businesses are using AI with Pinnasys.
Your digital workforce that never clocks out
168 hrs
Weekly capacity
4x
Human capacity
Turning Raw Data Into AI-Powered Business Intelligence
168 hrs
Operation Weekly
4x
Human Capacity
Have a similar challenge? Let’s talk.
Book a discovery call and we will discuss how AI can improve your outreach, lead intelligence, or sales automation — with realistic timelines and outcomes.