This tiny issue costs you 1% of your users

Let me tell you a quick one.

I was poking around our user base (something I do from time to time, just to smell the truth).

And I saw something off.

Emails like [email protected], [email protected].

Real people. Wrong domains.

I dug deeper.

Spotted patterns, wrote rules and pulled the numbers.

1%.

That’s how many users were affected.

What does that mean?

→ They never got our onboarding.
→ No updates, no nurture. No relationship.
→ Fewer sales.

They signed up… then disappeared.
But it wasn’t their fault.

It was one damn typo.

Now think about this:
You pay for traffic. Fight for clicks.
And then someone gives you their email.

But because they typed it from their phone (while crossing the street, bored, half-asleep, who knows), it goes nowhere.

And worse:
You keep emailing that ghost address.
Hurts your email sender score.
Spam rates up.
Other users stop receiving too.

So you’re not just losing that one person.
You’re losing more. Quietly.

Let me ask you something:
What’s 1% of your user base worth?

To us, it’s a lot.

At first, we reacted by rewriting emails in bulk.

That wasn’t enough.

“Let’s tell newcomers their email’s wrong,” someone said.
The classic “Oops! Email invalid.”

But I had other plans.

Why slap error messages and shame users when you can fix it for them?

Trip.com gets close. It suggests the most likely email provider as you type.

Smart.

But we went further:

We just fixed the typo.
Under the hood. Silently.

No alerts, just one fewer user lost.

That’s the vibe.
Invisible feature. Effective. Harder to copy.

So here’s your homework:

Go check how many of your users are vanishing… just because of a typo.
Fix it.
Reclaim your 1%.

❤️ Like this on Linkedin.

Takeaway

• About 1% of users vanished because of simple email typos, and we didn’t know.

• We fixed that under the hood instead of showing errors.

• The result? More conversions, better email deliverability, zero user friction.

Try This

You can use ZeroBounce Email Validation API to check for mistyped emails and their correct version with its did_you_mean property.

Or you can create the logic (less recommended). The following prompt gives you a list of rewrite rules to implement.

Tip: If can do a first preliminary analysis by creating a dynamic list on HubSpot for Gmail addresses alone.

Your goal is to spot common email typos.

Do it for these popular providers: Gmail, Hotmail/Outlook, Yahoo, iCloud, AOL, Proton Mail, Zoho, GMX.

Consider both the domain (name) and TLD (extension).

Present your rewrite rules in a nested list by provider and then by name and extension rewrite rule.