5 Email Marketing Mistakes That Are Costing You Sales

After working with a ton of ecommerce brands, I’ve seen the same issues pop up again and again.
Fix these, and you’ll see some quick wins. Let’s go:

Mistake #1: Leaving Smart Sending ON

This sneaky Klaviyo feature is costing you sales.

Here’s how it works:
If someone got an email from you in the past 16 hours, Klaviyo skips them on your flow emails.

So, if they abandoned a cart after opening your campaign, they’ll NEVER see that cart recovery email. Ouch.

Fix it:

• Go to your Flow email

• Click Settings

• Turn OFF Smart Sending

Boom, now everyone gets the emails they’re supposed to.

Mistake #2: You Don’t Actually Have an Abandoned Cart Flow

Think you have one? Double-check.

Most brands I work with only have a Checkout Abandonment Flow—not a true Added to Cart Flow.

Here’s the deal:
Klaviyo doesn’t add an abandoned cart trigger automatically. You’ve got to install it manually via Shopify.

Fix it:

1. Clone your Checkout Abandon Flow.

2. Switch the trigger to “Abandoned Cart.”

3. Start earning more from those cart abandoners.

Pro Tip: Check if you already have this set up by going to Metrics → Abandoned Cart.

Mistake #3: Sending Emails to EVERYONE

Sending campaigns to your whole list = straight to spam.

Why?

• Fake emails

• Dead subscribers

• Inboxes that never even open your stuff

Your open rates drop, your deliverability tanks, and suddenly, no one sees your emails anymore.

Fix it:
Only send to an engaged list—people who’ve opened or clicked in the last 60-90 days. This keeps your sender reputation strong and your emails visible.

Mistake #4: Ignoring Your Pop-Up Form

Your pop-up is where the email list magic happens.

Most brands get around 3-4% of site visitors to sign up. My clients? We aim for 10%.

More sign-ups = more people to sell to = more revenue. Simple math.

Fix it:
Take a look at your pop-up’s design, offer, and timing. Want a guide? I’ve got you—just reply and I’ll send it your way.

Subject Line: Stop Burning Cash on These Email Mistakes

Hey, it’s [Your Name]!

No fluff, let’s dive right into it:

5 Email Marketing Mistakes That Are Costing You Sales

After working with a ton of ecommerce brands, I’ve seen the same issues pop up again and again.
Fix these, and you’ll see some quick wins. Let’s go:

Mistake #1: Leaving Smart Sending ON

This sneaky Klaviyo feature is costing you sales.

Here’s how it works:
If someone got an email from you in the past 16 hours, Klaviyo skips them on your flow emails.

So, if they abandoned a cart after opening your campaign, they’ll NEVER see that cart recovery email. Ouch.

Fix it:

• Go to your Flow email

• Click Settings

• Turn OFF Smart Sending

Boom, now everyone gets the emails they’re supposed to.

Mistake #2: You Don’t Actually Have an Abandoned Cart Flow

Think you have one? Double-check.

Most brands I work with only have a Checkout Abandonment Flow—not a true Added to Cart Flow.

Here’s the deal:
Klaviyo doesn’t add an abandoned cart trigger automatically. You’ve got to install it manually via Shopify.

Fix it:

1. Clone your Checkout Abandon Flow.

2. Switch the trigger to “Abandoned Cart.”

3. Start earning more from those cart abandoners.

Pro Tip: Check if you already have this set up by going to Metrics → Abandoned Cart.

Mistake #3: Sending Emails to EVERYONE

Sending campaigns to your whole list = straight to spam.

Why?

• Fake emails

• Dead subscribers

• Inboxes that never even open your stuff

Your open rates drop, your deliverability tanks, and suddenly, no one sees your emails anymore.

Fix it:
Only send to an engaged list—people who’ve opened or clicked in the last 60-90 days. This keeps your sender reputation strong and your emails visible.

Mistake #4: Ignoring Your Pop-Up Form

Your pop-up is where the email list magic happens.

Most brands get around 3-4% of site visitors to sign up. My clients? We aim for 10%.

More sign-ups = more people to sell to = more revenue. Simple math.

Fix it:
Take a look at your pop-up’s design, offer, and timing. Want a guide? I’ve got you—just reply and I’ll send it your way.

Mistake #5: Only Sending “Salesy” Emails

If all your emails are sales, sales, sales… people will stop caring.

Mix it up! Build a list that actually enjoys hearing from you.
Here are a few non-sales email ideas:

• Fun facts about your product or industry

• Myth-busting common misconceptions

• Behind-the-scenes looks at your brand

• Funny customer reviews

More fun = more opens. More opens = more sales later.

Want to skip the guesswork?

I’ve helped brands fix these mistakes and make thousands more every month.

Book a call here: https://calendly.com/contactnagyzsombor/marketing

Let’s make it happen!
Nagy Zsombor