Check Email Format & RFC 5322 Compliance Instantly
Validate email address syntax and detect formatting errors. Catch invalid characters, typos, and RFC violations before data entry.
Enter an email address to validate its syntax and RFC 5322 compliance
Enter an email above and click Validate to see results.
Our syntax validator performs comprehensive format verification.
Validates that the email follows the official email format standard.
Detects invalid or disallowed characters in email addresses.
Verifies proper placement and count of the @ symbol.
Checks if the domain portion is properly formatted.
Verifies the address doesn't exceed maximum length limits.
Detects common email typos and misspellings.
These are the most common email syntax mistakes.
john.doe.com instead of [email protected]
[email protected] (consecutive dots)
john [email protected] (contains spaces)
john@doe%.com (contains %)
john@domain. (no top level domain)
[email protected] (invalid start)
Syntax validation is the first line of defense for email quality.
Syntax validation catches obvious errors before other verification steps, saving time and resources.
Identify misspelled or malformed emails during data entry or form submission, before they enter your database.
Real-time syntax validation in forms prevents invalid emails from being submitted in the first place.
Clean, properly formatted emails lead to better database hygiene and improved overall data quality.
Syntax validation is just the first step. Even if an email passes syntax checks, it still needs to be verified for domain existence, mailbox deliverability, and other factors. Use our full email verification tool for complete validation.
Upgrade to MailRook's complete email verification suite for full validation, bulk checking, and API access.
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Check email format and RFC 5322 compliance. No signup required. Unlimited free checks.