How To Use Cialdini’s 7 Laws Of Persuasion To Sell Effectively In Your Emails

Hey it’s Max from The Inbox Newsletter.

I was re-reading Cialdini’s book Influence this week and realized almost every email I’ve written that actually converted was leaning on one of his 7 principles of persuasion.

So today I want to walk through all 7, how to actually apply them inside your email strategy, and what each one looks like in practice so you can plug them into your own calendar.

Let’s get into it!

1) Scarcity

The reason scarcity works so well is because people always want what’s running out, and they’ll act way faster when they know someone else might grab it first.

That’s why the strategy here is to cap how many people can actually claim the offer and then stack a deadline on top of it so the subscriber feels two different kinds of pressure at once.

An email we love is wrapping the hero in something like “the first 100 customers only” with a midnight cutoff, and even building the scarcity into the discount code itself so every time the subscriber looks at it, the pressure resets.

That’s how you get the click in minutes instead of hours.

2) Authority

People trust credentials more than they trust claims, so if you can get an expert’s word doing the convincing for you, your copy barely has to lift a finger.

Make sure to to quote doctors, well-known figures, or recognized experts who back your product, and lead with who they are before you ever get to the pitch.

This works especially well for supplement, skincare, and health brands where credibility is the entire barrier to purchase…

Open the email with the expert’s name and credentials in their own voice, let them tell the subscriber why the product works, and only then introduce the CTA.

By the time the subscriber hits the button, they’ve already decided this person knows what they’re talking about.

3) Unity

Unity is much more effective than regular social proof because it taps into the subscriber’s identity directly. People say yes to brands they see as “one of us” instead of a company trying to sell to them.

So put your actual customers and community in your emails so readers see an identity they already want to belong to.

A format that works well is a section showing real customers wearing or using your product, credited by their handles or first names, with their actual words pulled in.

It’s not a stock photo and it’s not a paid influencer, which is the whole point. It’s people the subscriber could realistically be.

That turns the buying decision into joining a community instead of making a purchase.

4) Commitment

Once someone takes a small action with you, they’re way more likely to take the next bigger one because our brains want to stay consistent with what we already did.

So use as many gifts, revealed offers, or curiosity strategies to get the first click on the email, because that first click builds the momentum you need toward the actual sale.

An email we love for this is is one that leads a free mystery box or a hidden offer that requires the subscriber to click to reveal it.

By the time the subscriber has clicked once, they’ve already told themselves they’re interested, so taking the next step feels like the natural thing to do.

5) Liking

People buy from people they like, and that doesn’t change just because your brand is sending emails instead of selling in person.

So run founder-led emails with a real face, a relatable voice, and genuine value delivered before you ever ask for the sale.

We love pushing a first-person founder note that opens with something relatable the subscriber is probably feeling, walk through three or four actual tips or insights, and let the product show up almost as an afterthought at the very end.

By that point the subscriber already likes the founder, trusts them, and is primed to click without feeling pitched.

6) Reciprocity

When someone helps you first, you feel like you owe them one. It’s wired into how we’re built as humans, and it works just as well over email as it does in real life.

So give free value! Send free guides, how-tos, and real educational value inside your flows and campaigns so that when you finally do ask for the sale, buying from you feels like returning the favor.

I love sending full how-to emails that walks the subscriber through actually using the product with specific numbers, steps, and detail. The discount only shows up at the very bottom, after they’ve already gotten what feels like a free masterclass.

By that point the offer feels like a thank-you instead of a pitch.

7) Social Proof

Social proof is the oldest play in the book but the way it works in 2026 is completely different than it used to be. Nobody trusts star ratings or one-line testimonials anymore because everyone knows they’re easy to fake.

Instead go long on one real customer story and make it the hero of the entire email. Use specific details, actual language the customer used, the whole arc of their experience with the product.

A format we love is building the entire email around one customer, naming them, quoting their exact words, and letting their story do all the selling. The 50,000+ customer count or the star rating only shows up at the bottom as supporting evidence, because the story already did the convincing.

That’s what moves revenue in 2027 and beyond.

And that’s all 7.

Pick one that fits your next campaign and build the whole email around it!

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Email Inspiration Of The Day

Brand:
WIP

Email Design:
https://drive.google.com/file/d/1dXb1S-IAZKOeiJFSw94M8mBprCoCS3R_/view?usp=drive_link

Notes:
A short email, but a great example of fomo and scarcity at play. Classic!

Reply to this email if you have any questions or further content you want covered.

Cheers,

Max Sturtevant | Well Copy

P.S
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