My Highest‑Open Emails Share One Thing
How looking at my own stats changed the way I write subject lines on Substack
I’ve been watching my own Substack stats closely. And what I saw shocked me.
When I pulled a CSV export of around 150 emails from my Substack stats, one pattern smacked me in the face.
My highest‑open emails all did the same simple thing in each subject line.
They either named a fear you already feel… or promised a result you secretly want.
Look at a few of the titles my readers opened the most (with approximate open rates):
“Is Anyone Reading This?!” – 40%
“I feel like a fraud.” – 40%
“Sending Emails that Get Opened” – 36%
“🔥 Hot Substack SEO Tip: Get Found Faster!” – 37%
“Turning Content Into Profit” – 38%
Different topics, same basic pattern.
Each one either hits a nerve (am I wasting my time? am I a fraud?) or dangles a clear win (more opens, more SEO, more money).
Meanwhile, perfectly good emails with softer, more abstract titles sat in the middle of the pack. Not terrible. But not the ones people rushed to open.
The one thing in common
When I stripped the wording back, here’s what my top performers all shared:
They make one specific tension feel urgent and solvable.
Tension: “No one is reading me.”
Tension: “I’m not good enough.”
Tension: “This should be working by now, but it’s not.”
Tension: “I want more opens, more sales, more readers — and I don’t know how.”
If your subject line doesn’t press on a tension your reader is already carrying around, they’ll skim past it, even if the actual email is brilliant.
How to use this for your next send
Before you write another subject line, try this quick filter:
Write your subject as you normally would.
Underline the tension in it.
If you can’t find one, rewrite it.
Here are some examples you can steal and adapt:
Instead of: “Thoughts on Substack growth”
Use: “Why your last 3 Substack posts didn’t land (and how to fix it)”Instead of: “Some ideas about selling PDFs”
Use: “One sentence that sells more PDFs (I see it in my stats)”Instead of: “A word about my newsletter”
Use: “Is your Substack quietly dying in people’s inboxes?”
Wait. The body of your email also matters. Of course it does. But the subject line tension decides whether anyone even sees that body in the first place.
What I’m changing from here
You’ll see more subject lines from me that either name a fear or promise a clear win.
Why? Because that’s what the data says you respond to.
What’s coming next for PAID subscribers
[Paid Subscribers Only] Next, I’m going to walk you through how to do this for your own newsletter — step‑by‑step.
You’ll see:
How to pull a CSV of your email stats from Substack in a few clicks.
How to get an AI (not the one you might think) to surface your highest‑open subjects and the patterns they share.
How to turn those patterns into a simple checklist you can use before you hit “send” on every email.
It’s fast, it’s practical, and it means you stop guessing and start sending subject lines your own readers have already voted for with their attention.
If you want that breakdown — including the exact prompts I use using one AI tool to do the heavy lifting — keep an eye on your inbox for the paid‑only walk through.
Talk soon,
Mike
Substack Talent Producer
*A CSV is just a simple file format that stores your data in rows and columns, like a spreadsheet.
Great tips!
Simple, straightforward and spot on!
This is good stuff, Mike!