Email Validator

Validate email addresses for proper format and deliverability. Check syntax, domain existence, and MX records.

100% client-side No signup Free forever
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How to Use Email Validator

  1. Enter one or more email addresses (one per line)
  2. Click "Validate Email(s)"
  3. Review the validation results for each email
  4. Valid emails show green, invalid emails show red with specific issues
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Features

  • RFC 5322 compliant validation
  • Batch validation support
  • Disposable email detection
  • Detailed error messages
  • Domain validation
  • Local part length checking
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About Email Validator

Invalid email addresses waste marketing resources, damage sender reputation, and create bounce headaches. Our validator checks email addresses at multiple levels—from basic format to domain verification—helping you maintain clean email lists.

Validation Levels

Comprehensive email validation includes:

  • Syntax validation: Proper format according to RFC 5321/5322
  • Domain verification: Confirms the domain exists and resolves
  • MX record check: Verifies mail servers are configured for the domain
  • Disposable detection: Identifies temporary email services

Beyond Simple Regex

Basic regex catches obviously wrong formats but misses subtle issues. Our validator handles edge cases: plus addressing ([email protected]), international domains, quoted local parts, and IP address domains. RFC-compliant emails that "look wrong" are correctly validated.

Common Validation Scenarios

Form submissions: Verify addresses before accepting signups. List cleaning: Check existing contacts for invalid entries. Outreach prep: Validate prospects before campaigns. Development testing: Verify validation logic with edge cases.

Understanding Results

A valid format doesn't guarantee delivery—the mailbox might not exist. A valid domain doesn't mean the address works. The validator provides confidence levels: high for fully verified domains, medium for valid format but unverified mailbox.

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Frequently Asked Questions

What does email validation check?
We check multiple levels: format/syntax validity, domain existence (DNS), MX records (mail server configured), and optionally disposable email detection. This determines if an email address can likely receive mail, not just if it looks correct.
What is the difference between syntax and deliverability validation?
Syntax validation checks format (has @, valid characters). Deliverability validation checks if the domain exists and accepts email (DNS/MX records). A syntactically valid email might have a non-existent domain. We check both levels.
Why detect disposable email addresses?
Disposable emails (like 10minutemail, guerrillamail) are often used for spam signups, fake accounts, or avoiding commitments. Blocking them can reduce fake registrations. Our tool identifies known disposable email providers.
Can email validation guarantee deliverability?
No - we can verify the domain accepts email, but not that a specific mailbox exists. Full verification requires sending an email. Some servers reject connections from validators. Our checks confirm email is likely valid, not guaranteed deliverable.
What do MX records tell us?
MX (Mail Exchanger) records specify which servers handle email for a domain. No MX records typically means the domain can't receive email. We check for valid MX records and show which mail servers are configured.
How do I validate emails in bulk?
Paste multiple emails (one per line) or upload a CSV/TXT file. We validate each and export results with pass/fail status and reason for failures. This helps clean email lists before campaigns, reducing bounces.