Email Validator

This tool validates email format against RFC 5322 rules: presence of exactly one @ symbol, valid local part (before @), valid domain format with proper TLD, length constraints (local ≤ 64 chars, total ≤ 254 chars), no consecutive dots, and no leading/trailing dots. It also flags known disposable email providers.

No. Format validation only checks syntax rules. To verify if an email actually exists and can receive messages, you need to perform an MX record lookup and SMTP handshake — both require server-side processing. This tool runs entirely in your browser and cannot make DNS queries.

Disposable email services (like Mailinator, Guerrilla Mail, or 10minutemail) provide temporary email addresses that expire quickly. They're often used to bypass sign-up requirements or avoid spam. This tool checks the domain against a list of known disposable providers to help you detect fake sign-ups.

RFC 5321 defines: the local part (before @) must not exceed 64 characters, the domain must not exceed 255 characters, and the total email address must not exceed 254 characters. Exceeding these limits means some mail servers will reject the address even if it looks syntactically valid.

Common issues include: consecutive dots ([email protected]), leading/trailing dots in the local part ([email protected]), special characters not in the RFC 5322 allowed set, or an invalid TLD. Some technically valid RFC 5322 addresses (like quoted strings) are rejected by many mail servers in practice.