Email Format Validator
Check whether a string is a structurally valid email address, with a specific reason when it fails.
Checks structural format only (one @, a domain with a dot, no spaces) — not full RFC 5322 compliance, and it can't tell you whether the address actually exists or receives mail.
Valid format
For informational and educational purposes only — not professional or technical advice, and not a substitute for consulting a qualified professional about your specific situation. TrueMeasureKit is not liable for decisions made based on these results. See our Terms of Service.
Why "valid format" isn't "valid address"
The full email spec (RFC 5322) technically permits addresses stranger than most people expect — quoted local parts, escaped special characters, even spaces inside quotes. Most real-world validation, including this tool, deliberately checks a simpler practical subset instead: does it have exactly one @, a non-empty domain containing a dot, and no whitespace. The only way to confirm an address actually receives mail is to send a verification email — no amount of format checking can prove that.
Frequently asked questions
Does a structurally valid email mean the address actually exists?
No — this checks the format only (correct @ placement, valid domain structure, no illegal characters), which catches typos and malformed input, but the only way to confirm an address is real and reachable is to actually send it a message.