HTMLEmail Address Validator
Validate email addresses against RFC 5322 rules — checks local part, domain, TLD, and common typos. Shows a detailed breakdown: whether it passes format validation, if the domain looks real, any flags (disposable domains, common typos), and the parsed local/domain parts.
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Does this check if the email actually exists?
No — DNS/SMTP verification requires a server-side lookup. This tool validates format and structure in-browser. For live existence checks you need an email verification API.
What makes an email address invalid?
Common reasons: missing @, invalid characters in local part, missing TLD, consecutive dots, local part starting/ending with a dot, or domain with consecutive hyphens.