Email Validator

What is Email Validator?

Email Validator checks email address format against the RFC 5322 specification, which defines the precise syntax for valid local parts and domain names. It validates that the local part handles quoted strings, dot-atom format, and special characters correctly, while verifying the domain has valid DNS structure. The tool catches common typos in popular email domains (gmial.com, hotmial.com, outlok.com) and suggests corrections, and processes bulk lists with per-address validation results.

Web developers implementing form validation, CRM administrators cleaning contact data, and email marketers maintaining list quality. The tool runs entirely in your browser — your data never leaves your device.

How to Use Email Validator

1. Enter a single email address or paste a list for bulk validation
2. View the validation result — valid, invalid with reason, or valid-with-suggestion for typos
3. For bulk lists, download the validation report categorizing each address
4. Review suggested corrections for common domain misspellings before accepting them

Common Use Cases

• Validating email addresses on registration forms before submission to prevent typos
• Bulk-checking an imported email list for syntax errors before uploading to an ESP
• Catching common domain typos like gmail.con or yahoo.con that indicate user errors
• Verifying that programmatically generated email addresses follow RFC 5322 syntax rules

Pro Tips

• Technically valid RFC 5322 addresses can include characters like !#$%&'*+/=?^_`{|}~ in the local part — but most real-world systems reject them, so syntax validity alone does not mean deliverability
• The best validation regex is simpler than you think — checking for one @ with a non-empty local part and a domain with at least one dot catches 99.9% of real errors without false positives on unusual but valid addresses
• Typo detection catches more bad addresses than strict syntax checking — '[email protected]' is syntactically valid but will bounce; suggesting 'gmail.com' prevents this common error

Why Use This Tool?

• Privacy-first: All processing happens locally in your browser. No data is transmitted to any server.
• No installation required: Works in any modern browser on desktop or mobile.
• Completely free: No account, no credit card, no usage caps.
• Fast and reliable: Powered by modern Web APIs for near-instant results.

Related Concepts

Learn more about related topics: RFC 5322, MX record, Email syntax, DNS validation.

Frequently Asked Questions