Email validation is an essential step before sending any campaign. It helps you avoid high bounce rates, protect your sender reputation, and ensure your message reaches recipients’ inboxes. With more than 45% of campaigns ending up in spam, verifying emails is a must these days.
To check if an email address is valid, you can start with a basic syntax check, look up the domain, or search the address online for digital traces. For a faster and more reliable approach, use email verification tools like .
What you’ll learn from this guide:
What is email validation?
Benefits of email verification
How to check if an email address is valid in 5 easy ways
Email validation best practices
What is email validation?
Email verification, or email validation, is the process that lets you check if an email address is valid, properly structured, and currently active. Ideally, this practice should be an integral part of each campaign to prevent red flags with ESPs (email service providers).
The consequences of sending messages to invalid addresses go far beyond bounced rates and wasted budget. Over time, repeated failures to reach recipients signal to ESPs that your domain may not be trustworthy. This can harm your sender reputation, trigger spam filters, and ultimately reduce your overall deliverability.
Expert recommendation
If you’ve been sending campaigns to unverified contacts, your deliverability mobile database rate has most likely dropped already. If you notice any drop in key metrics, we strongly recommend running a deliverability test.
It will help you diagnose issues with domain health and sender reputation and, most importantly, provide personalized suggestions on how to fix them.
Now, let’s break down why you need to validate emails.
Why is email validation important?
Email validation isn’t a mere formality but a necessary measure before you hit unlock e-commerce success with klaviyo mail strategies send. Skip it, and your outreach performance will quickly decline.
Today, businesses all over the world understand the necessity of using email verification tools. They do proper email validation automatically, which helps:
Drive user engagement
Sending campaigns to inactive or invalid addresses can seriously skew your engagement metrics. Imagine this: when 20% of your list can’t receive emails, your open rates look terrible, even if everyone who gets your message actually reads it. This creates a false impression that your content isn’t resonating, when the real problem is that a chunk of your audience simply doesn’t exist.
That’s where a good email verification tool makes a real difference. It ensures you are reaching genuine, active contacts and gives you more accurate data to work with. With clear metrics, you can also better understand what content is performing well and when your audience is most engaged.
Improve email deliverability
When you send messages to inactive or invalid email addresses, they bounce back. This sets off spam filters and damages your credibility as a sender.
Once your reputation goes downhill, ESPs are more likely to redirect your messages straight to spam folders. In fact, as of 2023, roughly 45.6% of emails ended up in spam – not an outcome you want, do you? Email validation helps you reduce bounce rates by ensuring an up-to-date and clean email list. As a result, your deliverability rate remains stable, or even grows.
Feel free to check our free email deliverability guide
Lower expenses
Every invalid contact on your list equals money thrown away on messages that will never reach their intended recipients.
Email verification tools act like a cost-cutting filter for your marketing budget, helping you eliminate wasteful spending on contacts that can’t generate returns.
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How to check if an email address is valid?
We’ve put together five simple ways to help you verify emails without sending:
Do a manual email syntax check
Try a quick Google search
Check if the domain exists
Use email validation tools
Verify emails in bulk with
1. Do a manual email syntax check
You can start with a simple email syntax check to make sure the format of sale lead the address looks valid. There are a few obvious red flags you should watch for:
Missing @ symbols
Unusual spacing
Suspicious-looking domain names
Multiple @ symbols
Consecutive dots
Endings like “.con” instead of “.com”
These minor typos are more common than you’d expect, especially when people fill out forms quickly on mobile devices. Taking a few seconds to spot and fix these basic formatting issues can help you avoid bounces and protect your sender reputation right from the start.
Remember, a properly formatted email address usually includes three key parts