📧 Email Syntax Validator
Checks an email address's syntax against RFC 5321/5322 shape rules — local-part and domain structure, quoted local parts, length limits, domain label rules.
This checks format only. It does not check whether the domain exists, has mail servers (MX records), or whether the mailbox is real — none of that is possible without a network request, and this tool makes none. A syntactically valid address can still be undeliverable, and a real mailbox can technically use syntax this checker flags as unusual.
1. Email address
2. Verdict
—
3. Breakdown
| Local part | — |
|---|---|
| Local part length | — |
| Quoted local part? | — |
| Domain | — |
| Domain labels | — |
| Total length | — |