The “2-in-1” Loop

The “2-in-1” Loop
(from the GrowthKit Vault)

Most founders treat email and content as separate machines.

But if you link them up → your growth goes exponential.

I call it the “2-in-1 Loop”:

→ Write a weekly newsletter
→ Post that content on LinkedIn
→ Add a CTA to join your list
→ Send the next edition to those new subs
→ Repeat

The loop builds momentum.
Every post grows your list.
Every email grows your LinkedIn.

It’s how I added 50+ subs per day.

Use one asset to power both.

♻️ Loop it or lose it.

More content → more growth

Back when I was running MailNinja, I thought I needed 100 fresh ideas a month to grow.

BS.

What I actually needed?

One idea.
And a system.

That’s how I created the Content Waterfall System™—the same system I still use today to grow GrowthKit without burning out.

Here’s how it works:

💡 Step 1: Capture one powerful idea a week
Think: a belief, a hot take, a client mistake, a lesson from your past.
Something you’d rant about over coffee.

🎯 Step 2: Repurpose it across the flywheel
→ A LinkedIn post
→ A story in your newsletter
→ A quick Loom vid
→ A CTA to your lead magnet
→ A tweet
→ A post in your Skool community

One idea → 5+ assets.
No content calendar. Just clarity.

🔁 Step 3: Recycle what works
Great post? Repost it in 90 days.
Great email? Turn it into a post.
Run the system again next week.

This is how I show up daily.
Not because I hustle harder—
But because I systemised how I create.

More content ≠ more growth.
Better systems do.

Email Essentials

Before you optimise your emails…
make sure you understand them.

Email Essentials is your crash course in how to do email properly.
Not just best practices. Not just “how to write a subject line.”

This is foundational stuff that makes everything else actually work.

Here’s what we cover:

📌 → The fundamentals
→ 5 types of email (and when to send them)
→ The anatomy of a high-performing email
→ The WIIFM test every email should pass

🔥 → How to win more opens + clicks
→ Subject line & preview text stack
→ The 60/40 rule
→ Inverted pyramid layout
→ How to structure emails for scannability and flow

🧪 → Build trust and test everything
→ Why image-heavy emails don’t land
→ Mobile-first formatting
→ Emotions = clicks
→ Condense, rewrite, test again

This is the course I wish every founder would start with.
Because when you master the basics, the hacks actually work.

It’s all inside GrowthKit.

© GrowthKit, Doug Dennison and MailNinja 2005-2025 – All Rights Reserved

MailNinja ® is a registered trademark

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