Email verification tool
Keep your domain reputation safe and increase deliverability. Our email verification tool offers the most comprehensive set of checks to help reduce bounce rates and improve transactional email performance.
Verify email addresses in bulk


Real-time email verification API

Advanced verification with multiple checks
Why email validation is important
Maintain a good sender reputation and increase deliverability by filtering invalid and risky emails.
Save money by only sending emails to real recipients—don’t waste your emails on invalid email addresses.
Preserve the accuracy of your sending data and analytics for a more realistic overview of your performance.

Only send to valid email addresses

Avoid the spam folder

Experts in email deliverability
Pay-as-you-go email address verification
Starter
Premium
Enterprise
Frequently asked questions
What’s a valid email address?
A valid email address is any email address that meets certain technical and formatting requirements in order to be accepted by email servers. These include email addresses that have all the necessary parts: an email prefix and a domain name, are free from syntax errors and typos, and belong to active mailboxes (i.e. not disposable emails).
There are other types of email addresses, such as role-based and catch-all, that can technically accept incoming mail but may not be delivered to an actual person. These email addresses are considered risky.
What is an email verification tool?
An email address verification tool is a software application or service that is used to verify the accuracy and validity of email addresses. Email verifiers use various techniques to check the different elements of an email address to ensure that it’s likely to be deliverable.
Which file formats can I use to verify a list?
You can upload your list in the CSV file format.
Why is it important to validate email addresses before sending?
It’s important to verify email addresses before sending emails for several reasons:
Deliverability: Verifying email addresses ensures that the messages you send will reach the intended recipients. Invalid or non-existent email addresses will result in delivery errors and bounce messages, which can damage your sender reputation and deliverability. Check more ways to improve your deliverability.
Data quality: Verifying email addresses helps to maintain the quality and integrity of your email list. Invalid or outdated email addresses can lead to inaccurate data and make it more difficult to analyze your sendings.
User experience: Verifying email addresses helps to ensure a better user experience for your recipients. When an email is sent to an invalid address, the recipient will not receive the message and may become frustrated, which can lead to a negative perception of your brand. This is especially important for transactional emails.
Cost of sending: If you are sending emails to a large number of invalid email addresses, those sendings will still count towards your sending quota, resulting in unnecessarily inflated costs. Good email hygiene can save you money.
How do I verify an email?
There are a few ways to verify email addresses, including manually checking for common formatting errors and sending a confirmation email to the address. The best method, however, is to use an email validation service which will provide you with more accurate results and can check email addresses in bulk or provide real-time verification.
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Verify a single email address or upload an entire email list to verify in bulk.
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Ready to send fully optimized transactional emails?
Keep your recipient list clean and optimize your transactional email performance with MailerSend. There are no long-term commitments—see the magic for yourself.