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Email ID validation for better email delivery

Make sure you have valid emails from the start. You can integrate email ID validation into your web forms to correct bad addresses before they hurt your list.

The importance of email ID validation

Stop bad emails from ruining your sender reputation with email ID validation

What’s the easiest way to tank your email marketing program? Bad data.

The best responsive email designs, exciting subject lines, cool color scheme, and snappy copy won’t save an email marketing campaign that’s built with invalid email addresses.

Sure, the occasional hard bounce will happen with every send. But the higher your bounce rate, the more likely your sender reputation is at risk. That’s because major inbox providers watch for spammy behavior – including sending to invalid email addresses.

Stop bad email addresses before they ruin your email list. When someone signs up for your list, Mailgun’s email ID validation service double and triple-checks that you’re adding a real person to your list.

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An easy API for email address validation

Mailgun’s email validation tool to the rescue. It’s designed to validate email addresses submitted through forms like newsletters, registrations, and shopping carts. Integrate comprehensive email verification directly into the HTML on your site so that every lead is a lead you can use.

With Mailgun’s API, you get:

  • Mailbox detection directly verifies every email address with inbox providers like Gmail, Hotmail, Yahoo, and more so you know they actually have an email account

  • High-risk flags refuse disposable email addresses or other spammer indicators, like ones that include long strings of numbers and letters (like azaz09)

  • Grammar and syntax checks confirm local parts rules for major mailboxes, filtering out incorrect email addresses, like using a + sign for a Gmail account

  • Catch typos and common misspellings in domain names that come from filling out forms, like spelling “@outlooks” instead of “@Outlook.”

  • Back-end technical checks on MX records, SMTP mail servers, regular expression (regex) JavaScript, and more.

All of this happens thanks to Mailgun’s real-time API for developers. This email verification service gives you confidence that your email list is full of real people interested in your content, products, or services. No more bad data!

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What's an invalid email address?

An invalid email address is either improperly formatted or just doesn’t exist. A valid email address, of course, is one that’s properly formatted and does exist. Sometimes the difference is just a matter of filling out a form incorrectly (hey, it happens to the best of us!)

Let’s look at five examples of valid email addresses:






Now, here are five examples of invalid email addresses:

  • (missing username)

  • (missing @)

  • (leading dot is not permitted)

  • email@domain (missing top-level domain like .com or .net)

  • (leading dash in front of domain is invalid)

These are simple email ID mistakes that can easily be avoided when you verify email addresses with an email checker directly within your email forms.

Why every great email marketer needs email ID verification

One-fifth of legitimate business emails never appear in the targeted inbox. All that time spent on acquisition, lead generation, email marketing design and execution...gone in an instant.

Using an email validator, you can build an email list free of invalid email addresses and have a better chance of being in the 80%.

When Email Validation verifies an email address actually exists, you won’t waste money sending to temporary or disposable mailboxes, role-based email addresses (like info@), or bad email formats. Over time, this protects the reputation of your domain and IP address, reduces bounces, and offers a higher delivery rate.

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Build a squeaky clean email list with Mailgun

Mailgun’s email validation API takes the guesswork out of email address validation, so you don’t have to manually sift through your list. It’s the only email deliverability solution combining an email verification tool with an email delivery product.

One of the best things about Mailgun’s email address validator is you can try it out for free. It costs nothing to sign up for Mailgun. Right from the start, you get email analytics, five days of log retention, and 24×7 ticket support. Simply put, Mailgun’s email validation tool helps make email marketing more manageable and more profitable.

Check out our plans to bundle together features for better deliverability.

Other features

Explore more validation

Mailgun has a variety of features to complement email ID validation and help you improve your email list.

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Use Cases

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