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Email Syntax Checker

Validate the format of an email address.

What Is a Email Syntax Checker?

The Email Syntax Checker validates whether an email address is correctly formatted according to common rules. It checks the local part, domain, length limits, character set, and dot placement, and reports each issue found. This free online security tool is useful for email syntax checker, email validator, email address format checker. Common use cases include checking whether an email address follows common syntax and length rules before sending or storing it. It is designed for quick browser-based analysis and development workflows. Security checks are signals rather than guarantees, so production systems should also be validated against current standards and their specific threat model.

How to Use This Email Syntax Checker

  1. 1
    Enter the addressPaste the email address you want to validate.
  2. 2
    Check the syntaxThe tool examines the local part and domain structure.
  3. 3
    Review length limitsCheck whether the address fits the expected limits.
  4. 4
    Read the issuesInspect invalid characters, dot placement, or domain problems.
  5. 5
    Remember the limitationValid syntax does not prove that the mailbox exists.

Frequently Asked Questions

No. This checks syntax only. Confirming the mailbox actually exists would require sending a verification message.
The total address can be up to 254 characters, with a local part up to 64 characters and a domain up to 253 characters.
Exactly one '@', a valid local part with allowed characters, a well-formed domain with a top-level extension, and no invalid dot placement.

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