How to use Email Address Validator
The Email Validator checks an address for correct syntax and then verifies that its domain can actually receive mail by confirming MX records exist, helping you catch typos and dead addresses before they cost you. Sending to invalid addresses inflates your bounce rate, which mailbox providers read as a sign of poor list hygiene and use to lower your sender reputation. Use this tool to validate a single address, to clean a small list, or to sanity-check the address a user typed into a sign-up form before you store it and start mailing it.
- Enter the email address you want to validate.
- Click Validate to check syntax and domain records.
- Confirm the local part and domain form a valid address.
- Check that the domain publishes MX records for mail.
- Reject or correct addresses that fail either test.
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Syntax, domain and deliverability
Validation happens in layers. Syntax checking confirms the address has a sensible local part, a single @, and a plausible domain — catching the obvious typos like a missing dot or a stray space. Domain checking goes further by confirming the domain exists and publishes MX records, which proves it is at least configured to accept mail. Neither layer can guarantee a specific mailbox exists without sending to it, but together they eliminate the large majority of bad addresses cheaply and without risking your reputation.
| Layer | What it confirms |
|---|---|
| Syntax | The address is well-formed |
| Domain / MX | The domain can receive mail |
| Mailbox | The specific inbox exists (needs SMTP probe) |
Why list hygiene protects deliverability
Mailbox providers judge senders partly on how many messages bounce. A list full of mistyped or abandoned addresses produces hard bounces that signal carelessness, and enough of them can land your mail in spam folders or get it blocked entirely. Validating addresses at the point of capture — on the sign-up form — is the most effective fix, stopping bad data before it enters your system. Periodically re-validating an existing list catches domains that have since gone dark. Clean lists deliver better and cost less to send.
Glossary
- Email validation
- Checking that an address is well-formed and its domain can receive mail.
- MX record
- A DNS record naming the mail servers for a domain.
- Hard bounce
- A permanent delivery failure, often from an invalid address.
- List hygiene
- Keeping a mailing list free of invalid and inactive addresses.
- Local part
- The portion of an email address before the @ sign.
Related reading
Frequently Asked Questions
Why use Email Address Validator?
- Validate email address syntax and domain MX records in a single check
- Catch obvious typos in addresses before they enter your mailing list
- Confirm a domain is configured to receive mail before attempting delivery
- Reduce hard bounces by screening addresses at the point of capture
Common use cases
- Validate an address a user typed into a sign-up form before storing it
- Screen a manually compiled list for obviously invalid addresses before a send
- Confirm a corporate email domain publishes MX records before adding it to a CRM
- Debug a form that never received a confirmation email by checking the address
- Identify whether a former-employee domain still has active mail servers
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