Email Validator

What is Email Validation?

Email validation is the process of checking whether an email address is formatted correctly and follows the established standards for email addresses (RFC 5322).

Validation Types

• Syntax Validation: Checks proper format and structure
• Domain Validation: Verifies domain name structure
• Typo Detection: Identifies common mistakes
• Suggestion Engine: Provides correction recommendations

Common Uses

• Form Validation: Website registration and contact forms
• Mailing Lists: Clean up email databases
• Marketing: Improve email deliverability
• Data Quality: Maintain clean contact records
• User Experience: Help users correct typos
• Compliance: Meet email marketing standards

Benefits

• Better Deliverability: Reduce bounce rates
• Cost Savings: Avoid sending to invalid addresses
• Data Quality: Maintain accurate records
• User Experience: Catch errors early

Email Format Rules

• Structure: local-part@domain
• Length: Maximum 320 characters total
• Local Part: Maximum 64 characters
• Domain: Maximum 253 characters
• Characters: Letters, numbers, dots, hyphens
• Case: Generally case-insensitive

Common Invalid Formats

• Missing @: userexample.com
• Multiple @: user@domain@com
• Spaces: user @example.com
• Invalid chars: user#example.com
• Double dots: [email protected]
• Starting/ending dots: [email protected]

Domain Validation

• Valid TLD: Must end with valid top-level domain
• No spaces: Domain cannot contain spaces
• Hyphens: Cannot start or end with hyphen
• Length: Each part max 63 characters

Limitations

• Format Only: Checks structure, not deliverability
• No Mail Server: Doesn't verify server exists
• No Inbox Check: Can't confirm if address is active
• Privacy: Respects user privacy (no external checks)