Validate email

Check an ordinary email address for local-part, domain, and length syntax.

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ToolEmail Validator
Input
Output
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Preview

How it works

The address is trimmed, split at its at-sign, checked for local and domain lengths and dot placement, and matched against a simplified addr-spec pattern. It validates syntax only and does not send mail or query DNS.

  • The local and domain length limits follow common mailbox constraints.
  • The pattern targets ordinary dot-atom addresses rather than every obsolete RFC form.

Worked example

Valid Email
Validate a standard email address
Input
											[email protected]
Output
												Valid email: [email protected]

When to use this

Signup forms, mailing-list imports, and SMTP configuration validate addresses.

Edge cases

  • A local part beginning or ending with a dot is invalid.
  • Consecutive local-part dots are rejected.
  • A syntactically valid address may have no DNS or mailbox.

References