Email Syntax Validator

Email Syntax Validator is a free online tool that checks whether email addresses are properly formatted using advanced regex pattern matching and domain analysis. It goes beyond basic @ and dot checks to validate against RFC standards, detect common typos, flag disposable and role-based addresses, and provide detailed per-check diagnostic reports.

Whether you're cleaning an email list before a campaign, validating form inputs during development, or just checking a single address — this tool handles single and bulk validation with detailed results. Everything runs in your browser — no emails are ever sent to a server.

• RFC 5322 syntax validation: Checks local part, @ symbol, domain, and TLD against email standards
• Detailed diagnostic report: Individual pass/fail for 8+ checks with explanations
• Typo detection: Catches common domain misspellings (gmial.com, yaho.com) and suggests corrections
• Disposable domain detection: Flags temporary/throwaway email services (100+ known domains)
• Role-based detection: Identifies functional addresses like admin@, info@, noreply@
• Bulk validation: Process up to 10,000 emails at once with summary statistics
• Export results: Download valid, invalid, or all results as CSV or text
• Visual status indicators: Green (valid), red (invalid), yellow (warning) for instant scanning
• Copy filtered lists: One-click copy of only valid or only invalid emails
• 100% client-side: No server, no data transmitted, fully private

1. Enter an email: Type or paste an email address in the input field.
2. See instant results: The validation runs automatically showing pass/fail for each check.
3. Review diagnostics: Expand the detailed report to see exactly which checks passed or failed.
4. Bulk mode: Switch to Bulk, paste multiple emails, and click Validate All for batch processing.
5. Export results: Copy or download the valid/invalid lists for your records.

Valid: john.doe@gmail.com → ✅ All checks passed

Typo detected: user@gmial.com → ⚠️ Did you mean gmail.com?

Invalid format: user@@domain.com → ❌ Multiple @ symbols

Disposable: test@mailinator.com → ⚠️ Disposable email domain

Role-based: admin@company.com → ⚠️ Role-based address

Missing TLD: user@domain → ❌ Domain has no TLD

• Clean your list: Remove invalid addresses before sending campaigns to protect sender reputation
• Catch typos: Auto-suggest corrections for common domain misspellings
• Reduce bounces: Syntax validation catches obviously bad addresses before they bounce
• Flag risky addresses: Disposable and role-based warnings help prioritise real contacts
• Developer-friendly: Test regex patterns and form validation logic
• Free and private: No data leaves your browser, no limits on usage