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The fastest email address verification service to reach the most customers

Don’t rely on bulk emails. Reach the most customers with the fastest email address verification service. With InboxReady Email Verification, you won’t waste your time or email marketing budget on email addresses that don’t exist.

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A graphic illustration showing how a single email verification catches invalid email addresses.

Protect Your Business

A bad email address is a lost customer

Over 20% of your email database will go bad this year. Invalid email addresses result in unnecessary bounces, drive down your engagement metrics, damage your sender reputation, and cost you money.

How much time and money are you wasting on bad leads?

Mailgun’s entire business is sending emails. We send more than 250 billion emails every year, so we’ve hashed the majority of active email addresses. We know what’s deliverable and what’s not.

Plus, our quick Email Verification software is part of an integrated suite of deliverability features and services. You don’t have to worry about wasting time and effort switching between different platforms and data sources.

Instant Email Verification

The InboxReady advantage

Better. Faster. Safer. Find out what you can do with our Email Verification features.

Cut down on bouncebacks

Get more emails into your recipients’ mailboxes. Customers who verify email addresses with us before they send have a 21% lower bounce rate, dramatically improving their delivery rates.

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A graphic illustration showing bulk verification using Mailgun.

Save time for yourself and your customers

InboxReady provides the fastest Email Verification service in the industry. We minimize latency to ensure that your signup, checkout, or form submission page never slows down.

When verifying large contact lists, get your results in minutes instead of hours or days. Need to clean a list with millions of addresses? Walk to the breakroom, grab a cup of coffee, and come back to a clean email list.

Protect your platform from abuse without sacrificing performance

Bot attacks can turn into full-blown DDoS attacks if detected too late. Are your users trying to trick your platform with grammar rules? Our email checker flags that information too.

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Versatile Features and Smooth Integration

Verify both current and new addresses

Check email validity at signup to make sure you’re capturing good data. Clean your list periodically to make sure it stays that way.

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Real-time Email Verification API

Verify email addresses at the point of capture to reduce invalid signups with our real-time Email Verification integration.

List verification feature

Clean your subscriber list of invalid emails before you hit send. Our list verification feature is as simple as uploading a .csv.

Not sure whether your list needs a clean? Run a list preview. This email tester is a version of our Email Verification feature and can help you assess a statistically significant sample of your list so that you can decide whether you need to clean the rest.

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Best-in-Class Email Verification

Industry-leading, proprietary features for optimal results

All of our email deliverability features are built in-house, from the ground up, backed by our years of expertise in sending emails.

Verify your entire email list at once and reduce email bounce rates. Easily identify valid email addresses, role-based addresses, typos, and more. InboxReady Email Verification features go beyond simple grammar rules – we check email addresses directly with the mailbox to confirm that every address on your list is real. That’s accuracy you can rely on.

InboxReady offers:

  • Lightning-fast Email Verification

  • Mailbox/MX verification

  • Role-based address verification

  • Disposable address verification

  • Catch-all address verification

  • Suggestions for suspected typos

  • RFC grammar rule check

Cinemark logo.

"Mailgun Email Verifications API is simple and incredibly accurate. It allows our customers to make changes to their email address quickly, which only adds to the product’s value-add."

Joe Dan Galyean

Vice President of Software Development at Cinemark


What’s email verification?

Email verification is a process that checks if an email address is deliverable. In other words, this tool determines if it’s possible to deliver mail to that email address before you send an email.

Why is email verification important?

Email verification is important because it:

  • Boosts your delivery rate by removing invalid email addresses.

  • Maintains your mailing list hygiene by keeping your email list up-to-date.

  • Improves your email marketing metrics like click-through rate (CTR), open rate, and click-to-open ratio (CTOR).

  • Protects your sender reputation.

How does email verification impact my email deliverability?

Email deliverability is highly impacted by bounced emails. Decrease email bounces by performing email verifications ahead of time.

Your IP address and domain reputation takes a hit when your email service provider (ESP) can’t place your email into a subscriber’s inbox. This impacts future deliverability because email clients rely on IP and sender reputations to determine whether or not to deliver your messages. If you have a bad sender or IP reputation, email clients may decide to place emails sent from your domain name in your subscriber’s spam folder. Or, they may not deliver them at all.

When should I validate my email list?

If you’ve bought a mailing list (which we highly recommend that you don’t) or if you’ve inherited a mailing list you’re unfamiliar with, it’s a great idea to use an email verifier.

In addition, if your list has grown or it’s been some time since you last verified your email addresses, we recommend that you give your mailing list a health check today.

What do Mailgun’s Email Verification tools check for?

Mailgun’s Email Verifications tools checks for the following:

  • The email address syntax is correct.

  • The domain is set up to receive email.

  • The email address exists.

  • The address doesn’t have any cached bounce events from the Mailgun network.

  • The email address isn’t a high-risk address.

  • The email address isn’t a role-based email address such as or

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