Email Format Validator

About the Email Format Validator

Type an email address and the tool checks its format and, when it is not valid, says which part is wrong: a missing @, more than one @, consecutive or leading dots, a character that is not allowed, or a domain without a proper top-level domain.

It checks the format only. It cannot tell whether a mailbox exists or can receive mail; the only reliable test for that is sending a message.

How to use it

1. Type or paste an email address, or press Sample Email.
2. Read whether the format is valid.
3. If it is not, read the reason shown, fix that part and check again.

Worked example

ada@example.com would pass, with local part ada and domain example.com.

ada@example

Invalid: Domain is missing a top-level domain (e.g. .com)

Common mistakes and gotchas

• Format-valid does not mean deliverable. Typos such as gmial.com are well-formed addresses.
• Addresses with non-ASCII letters, such as üser@exämple.com, are reported as containing a character that is not allowed, even though internationalised addresses exist; convert the domain to its ASCII (punycode) form to test it.
• Quoted local parts ("a b"@example.com) are rare and are not accepted by this checker.
• Plus addressing (name+tag@example.com) is valid and accepted.

Frequently asked questions