Email Validator
Validate single or multiple email addresses instantly. Free and secure.
Email Validator
Validate email addresses with detailed feedback
How to Validate Email Addresses Online
Type or paste one email address or a bulk list. For bulk validation, paste multiple addresses separated by commas, semicolons, or newlines.
The validator checks format, structure, and domain syntax against RFC 5321/5322 rules. Each address is flagged as valid or invalid with the specific reason.
Remove invalid addresses before importing into your email marketing tool, CRM, or database. Copy the validated list directly.
Email Address Format Breakdown
Letters, numbers, dots, hyphens, underscores, plus signs. Max 64 characters. Case-insensitive in practice.
Must be a valid hostname. Letters, numbers, hyphens. Each label max 63 chars. No leading/trailing hyphens.
Top-level domain: .com, .org, .net, .io, .co.uk, etc. Minimum 2 characters.
Common Email Validation Errors
| Invalid Email | Problem |
|---|---|
| user@ | Missing domain — no domain after @ |
| @domain.com | Missing local part — nothing before @ |
| user @domain.com | Space in local part — not allowed |
| user@domain | Missing TLD — no dot after domain name |
| user@dom ain.com | Space in domain — not allowed |
| user@domain..com | Double dot in domain — not allowed |
| user@.domain.com | Domain starts with dot — not allowed |
| user@domain.c | TLD too short — minimum 2 characters |
Why Validate Emails Before Sending?
Frequently Asked Questions
Common questions about Email Validator