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Our emails make it past spam and people are happy about it

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Email excerpt stating the sender receives at least 10 LinkedIn messages daily, 80% irrelevant to their role or industry and ignored, but this one made them chuckle and piqued their interest.
Screenshot of an email message reading, 'Just wanted to say- I LOVE your cold outreach style!'
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Email message with subject 'team training' showing a brief reply saying, 'It'd be really interesting to hear more about this.'
Email from James Campbell to Felix with CC to another recipient saying, 'Top cold email. Happy to chat based on that alone. Can we do 1pm Monday or 12pm Tuesday?'
Email snippet from Louisa Z to mark.k@findofficespots.com saying, 'Interesting … pls tell me more Mark! FYI we are a team of 10.'
Email excerpt praising a good outreach email and requesting a one-page document.
Email snippet saying: 'Great pitch, Interested! Let us know.'
Email message stating interest in a call to discuss further with text: 'Would be great to jump on a call please to discuss the below. I would absolutely be interested.'
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Check out the incredible results we’re getting

30+
Successful Clients
2m+
Emails Sent per Month
1:198
positive reply rate
Training & Recruitment
How we added £1.1m revenue & £5.4m pipeline in 9 months for BePro using an underutilised government funding initiative.
Marketing Agency
How we generated 120-150 new monthly leads and £2.1m in pipeline in 10 months for Hummingbird.
Marketing Agency
How we created £440k in pipeline in only 3 months for Lyra Studios using a compelling offer to create custom experiential marketing concepts.
View all case studies
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We’ve helped 40+ businesses never worry about sales again

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"StackOptimise built the outbound system we needed to hit our growth goals."
"StackOptimise built the outbound system we needed to hit our growth goals."
Kieran Routledge
Field Sales Manager @ JRI Orthopaedics
Verified Client
"We are seeing awesome results from the StackOptimise managed outbound system."
"We are seeing awesome results from the StackOptimise managed outbound system."
Will Heylings
CRO @ Atom Learning
Verified Client
“We really struggled with email until StackOptimise helped us out."
“We really struggled with email until StackOptimise helped us out."
Lucy Ham
SDR Manager @ NetBase Quid
Verified Client
“You’re so different. I don’t see anyone doing your approach of lead generation for email... and it works”
“You’re so different. I don’t see anyone doing your approach of lead generation for email... and it works”
Mark Knops
CEO @ SketchLabs
Verified Client
“We’ve completely transformed our sales funnel in terms of volume of opportunity and where the opportunities are coming from. Cold email has consistently delivered around the clock with a consistent conversion rate. This is the most effective way that we’ve found of growing opportunities, growing the sales funnel... even in a super competitive market.”
“We’ve completely transformed our sales funnel in terms of volume of opportunity and where the opportunities are coming from. Cold email has consistently delivered around the clock with a consistent conversion rate. This is the most effective way that we’ve found of growing opportunities, growing the sales funnel... even in a super competitive market.”
Adam Jones
Chief Customer Officer @ BePro
Verified Client
“Sales-tech wizards!”
“Sales-tech wizards!”
Ben Tolliday
Regional Director @ Multiverse
Verified Client
“Felix and Penn are absolute guns at outbound. They’re incredible marketing tacticians with serious tech skills. While everyone else is just recycling the same templates that stop working in a few weeks, these guys are the ones finding the new things that actually work. It’s been an absolute privilege working with them and I couldn’t recommend them more highly.”
“Felix and Penn are absolute guns at outbound. They’re incredible marketing tacticians with serious tech skills. While everyone else is just recycling the same templates that stop working in a few weeks, these guys are the ones finding the new things that actually work. It’s been an absolute privilege working with them and I couldn’t recommend them more highly.”
Tyce Hilton
Founder @ Landing Page Labs
Verified Client
"Experts when it comes to sales-tech, automation and outbound systems"
"Experts when it comes to sales-tech, automation and outbound systems"
Sam Gillingham
Co-Founder @ RocketPhone
Verified Client
“ I’ve been blown away by the results. The team are very engaged. They use all the bleeding edge tools to make sure we’re sending high quality emails to the right people at the right time... More leads are coming every day... certainly recommend using StackOptimise”
“ I’ve been blown away by the results. The team are very engaged. They use all the bleeding edge tools to make sure we’re sending high quality emails to the right people at the right time... More leads are coming every day... certainly recommend using StackOptimise”
Mike Lee
Founder @ Outlier
Verified Client
“We’d use previous cold email agencies and hadn’t been impressed with the results. Since working with Felix and the team we’ve consistently been getting leads and meetings booked in. Prospects respond with literally “good email let’s book in a call”.”
“We’d use previous cold email agencies and hadn’t been impressed with the results. Since working with Felix and the team we’ve consistently been getting leads and meetings booked in. Prospects respond with literally “good email let’s book in a call”.”
Mike Heap
Founder @ MyAskAI
Verified Client
“Our GTM process was really manual. StackOptimise helped us upgrade the whole process and have given us a nice steady stream of quality leads. We’ve been really impressed with the quality of the personalisation in the emails. They’re super easy to work with... can’t recommend them enough.”
“Our GTM process was really manual. StackOptimise helped us upgrade the whole process and have given us a nice steady stream of quality leads. We’ve been really impressed with the quality of the personalisation in the emails. They’re super easy to work with... can’t recommend them enough.”
Matthew Harris
CRO @ Brandbassador
Verified Client
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In case you’re wondering how we’re different

Here’s how we compare...
Traditional Agencies
DIY/Inhouse
Lead magnet creation
150k enterprise tech stack
Certified Clay, Smartlead & GetSales  experts
62% more positive replies than industry average
Insights from 5M+ emails
Mobile number generation
Rigorous a/b testing & campaign iteration
CRM integration
Run by sales veterans, with over 15 years combined experience
Dynamic client dashboards

Created by sales leaders to help grow sales

Most agencies start with good intentions but little actual sales experience and end up learning on your dollar. Not us. With a combined 15 years in the trenches, starting as SDRs, closing deals as AEs, and leading teams as Heads of Sales—we know what it takes to drive pipeline and hit ambitious growth goals.

After now sending 2.5M+ emails and driving £5.2M+ in pipeline, we’ve tested every tool, strategy, and workflow to create the automated outbound engine we wish we’d had. Backed by a top team of GTM engineers we take the guesswork out of outbound so you can scale with confidence.
Two men sitting at a glass table with a laptop and tissue box, labeled Penn on left and Felix on right.
Badges of official partners Clay Expert, Smartlead.ai Certified Partner, and GetSales.io Certified Expert on a purple gradient background with text 'Official Partners of' above and '(1 of 1 in the world)' below.

As seen on

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What are you waiting for? We’ll be a great fit if:

You’re ready to fill your calendar with high-quality meetings and focus on closing deals
You’re tired of generic outreach that doesn’t deliver and want an intent-driven approach powered by unique data
You want to scale outbound as a channel without increasing headcount
You want access to playbooks that are working right now for businesses like yours
You’re tired of spending money on expensive tools, ads and agencies without seeing results
You want to work with a team that genuinely cares, communicates, and works like an extension of your own

Got questions?
We got answers

What kind of results can I expect?

You can expect 28 to 50 highly interested leads from your exact ICP every month. Exact numbers will depend on your industry and market size.

The best way to understand what this could look like for your business is to book a demo, where we’ll walk you through the results you can expect. Or, if you prefer, claim your free outbound action plan to get a detailed breakdown - no meeting required.

On average, our clients see a 62% higher positive reply rate than the industry standard.

Here’s why:

✅ We craft messaging tailored to your market - not generic templates.

✅ We use direct response copywriting designed to increase replies and drive action.

✅ We proactively optimise campaigns, refining strategy to improve results over time


✅ We act as a growth partner, not just a service provider.


✅ We provide full visibility with a live dashboard and weekly updates so you always know what’s working.

How quickly will I start seeing results?

We launch as fast as possible without compromising success. From day one, we set up your deliverability infrastructure, including secondary domains and new email accounts. These are warmed in a premium warm-up pool for two weeks, ensuring a high email score and strong inbox placement. While that’s happening, we build your campaign strategy, identifying the best approach to drive replies and crafting high-converting email copy. By week 3, outreach begins. Positive replies can come in within days with most campaigns seeing traction within the first week of launch.

Do you offer guaranteed results?

We have an exceptional success rate and only partner with businesses we’re extremely confident we can win for. That’s why, in nearly every case, we deliver outstanding results.

But in rare situations, market factors beyond our control like shifts in demand, changing regulations, or economic downturns can impact performance. That’s the only reason we can’t guarantee specific numbers.

What we do guarantee is a relentless commitment to success. We’ve helped 25+ businesses generate incredible results across marketing agencies, B2B software, training and recruitment, real estate, and consulting. We use a $150K enterprise tech stack, proven strategies, and continuous optimisation to maximise performance.

We’re one of the leading outbound agencies for a reason. Just check out our case studies. If we take you on, it’s because we know we can deliver. And if we can’t make outbound work for you, no one can.

Will I be able to approve email copy and lead lists?

Yes. You’ll have full visibility and the option to review messaging, lead targeting, and personalisation strategy before campaigns go live - so you’re always aware of what’s happening.

We believe in complete transparency and value your input, but we also know your time is valuable. That’s why we keep you informed without adding extra work, ensuring you stay in the loop while we handle all the heavy lifting.

What visibility do I have over the campaign?

You’ll know exactly what’s happening and how your campaign is performing at all times. We set up an easy-to-use dashboard where you can track real-time performance, including emails sent, replies, and booked meetings. You’ll receive weekly updates on key metrics, planned optimisations, and next steps. Plus, we hold a monthly campaign review meeting to dive deeper into results, strategy, and improvements - keeping you fully informed while we handle the execution.

Do I need to commit to a long term contract?

We ask for a 90-day commitment, then it’s month-to-month with zero lock-in.

Why? Because outbound done right takes time. The first few weeks are dedicated to setting up deliverability infrastructure, warming inboxes, and refining targeting - laying the foundation for high reply rates and strong inbox placement. From there, we test, optimise, and scale to build a system that delivers consistent, high-quality pipeline.

A shorter commitment would mean cutting corners or running a campaign that’s too simple to generate real ROI. 90 days is the minimum time needed to build, refine, and scale an outbound engine that actually works.

After that, it’s your call. By then, you’ll have seen the results and we’re confident you’ll want to keep going. But we don’t do long-term contracts. Just enough time to prove the impact and set you up for real growth.

Do I need to do anything?

We handle everything - from building lead lists to generating positive replies, so you can focus on closing deals. All we need is a single point of contact on your end to help align stakeholders and coordinate any internal resources, but it’s light project management at most. We also provide detailed lead handovers, fast lead alerts, giving your sales team everything they need to turn the interested leads we generated into new customers.

How do I know if outbound is right for my business?

If you sell a high-ticket B2B service that solves a real problem, and there are at least 5,000 people in your target market, outbound is probably one of the most effective growth channels you can use.

Unlike other channels where you wait for leads to come to you, outbound lets you go straight to the people you can help most. We find those prospects for you and use live buying signals to reach out when they’re most likely to say yes. It’s faster, more precise, and gives you control over your pipeline. The more messages we send, the more customers you get.

Still unsure? Book a quick demo and we’ll take a look at your business to give you an honest answer.

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