Free Online Email Validator

1. Paste an email address into the input field.
2. A pass/fail indicator appears immediately, naming the specific check that failed.
3. Disposable-provider matches are flagged separately so you can decide policy.
4. Try variants if the result surprises you — most failures are a missing dot or stray space.

Syntactic email validation catches typos before they hit your signup form or marketing list. It cannot prove that an inbox is real — only sending a confirmation message can do that — but it filters out the obvious garbage. The standard checks per RFC 5322 cover length, presence of a single @, allowed characters in the local part, and a domain with at least one dot.

Product teams plug this kind of check into sign-up flows to reduce dead leads. QA engineers use it when sanitising customer-data exports. Account managers paste in lists to spot mistyped addresses before sending campaigns. This validator goes further than syntax: it flags addresses from common disposable-mail providers (Mailinator, Guerrilla Mail, 10minutemail and similar), letting you decide whether to accept them.

Everything runs locally — no addresses are looked up against external services, logged or transmitted. For full deliverability checking (MX lookup, SMTP probing) you'll need a server-side service.