Email Address Validator
Validate a list of email addresses — syntax, common typos, role addresses and disposable domains.
Quick answer: Email Address Validator: validate a list of email addresses — syntax, common typos, role addresses and disposable domains. Runs entirely in your browser, free, no signup.
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Validation happens in layers, and it helps to know what each layer can and cannot prove. Syntax checking against RFC 5322 and the length limits catches malformed addresses; typo detection rescues near-misses like gmial.com; role and disposable-domain flags surface addresses that tend to hurt list health. What none of this does is confirm the mailbox actually exists.
Proving deliverability requires an SMTP handshake with the receiving server, which a browser cannot perform — so treat a "valid" result here as "well-formed and plausible," not "guaranteed to receive mail." That said, catching the syntax errors, obvious typos, and throwaway domains removes the large majority of bad addresses before you ever hit send, which protects your sender reputation.
Role addresses such as info@ or support@ route to shared inboxes and are frequently filtered by email platforms, so flagging them lets you decide whether to keep them. Everything runs locally, so even a confidential contact list is safe to paste. To clean the surviving list of duplicates and stray formatting, follow up with the CSV cleaner.
Frequently asked questions
- Does this confirm the email actually exists?
- No — that needs an SMTP probe to the receiving server, which browsers can't do. We catch the most common 80% of invalid addresses (typos, syntax, disposable) without sending any traffic.
- What's a 'role address' and why flag it?
- Addresses like info@, admin@, support@ go to a shared inbox, not a person. They're often blocked by ESPs and have low engagement, so flagging helps you keep your list healthy.
- How big a list can I validate?
- We've tested with 50,000 addresses and the table renders smoothly. Larger lists work too but the table virtualisation isn't smart enough yet to keep scrolling instant.
- Is my list uploaded?
- No — every check runs in your browser. Even confidential lists are safe.
- What disposable domains do you cover?
- About 20 of the most popular (mailinator, guerrillamail, yopmail, sharklasers, tempmail, etc.). For exhaustive coverage you'd want a paid validation API.