Email syntax validator
Check an email address for common syntax problems. A valid result means the format looks acceptable. It does not mean the mailbox exists or can receive mail.
It runs in your browser. What you enter stays on this device.
How to use it
- 1Type or paste one email address.
- 2Choose Check.
- 3Read the syntax result and any suggested domain correction.
- 4Choose Clear to empty the box and hide the result.
When it helps
- Catch a missing @ before a form is saved.
- Spot a likely domain typo such as gmial.com.
- See why an address fails a length or punctuation rule.
Good to know
- This check does not send email, open an SMTP connection, or look up DNS. Mailbox verification stays unchecked.
- A syntactically valid address can still be undeliverable, and a rejected address can still be one this checker does not recognize.
- Quoted names and domain literals in brackets are not accepted.
- Unicode names and domains are allowed as written. They are not converted to punycode.
- Suggestions cover a short list of common domain typos, not every misspelling.
- The input stays under 500 KB.
Questions
Does a valid result mean the mailbox exists?
No. The tool only checks the written form of the address. It cannot tell you that anyone receives mail there.
Is the address uploaded?
No. The syntax check runs in this browser. The address is not sent to a server or included in analytics.
Related tools
MX record checker MX record checker
See the mail servers a domain publishes. This does not prove a mailbox exists.
Email