Paste any email address and get an instant read on whether it's structurally valid, flags common typos in popular domains, and warns you about disposable or role-based mailboxes before you add it to a list.
This tool runs a series of checks the moment you click Check address, entirely inside your browser tab. First, it tests the address against the RFC 5322 grammar that defines what a technically valid email address looks like — correct placement of the @ symbol, an allowed set of characters in the local part, and a properly formed domain with a top-level domain such as .com or .org.
Beyond raw syntax, the checker also looks for signals that are useful in practice but aren't part of the formal spec: whether the domain matches a known disposable-email provider, whether the local part looks like a shared role inbox (info@, support@, admin@) rather than a person, and whether the domain resembles a common typo of a major provider like Gmail or Yahoo. None of this requires contacting a mail server, so results appear instantly and your input is never transmitted.
Format validation cannot confirm that a specific mailbox exists or is currently accepting mail — that requires an SMTP-level check or an actual send. If you need a closer approximation that also checks whether the domain has active mail servers, use the Email Deliverability Tester, which adds a live MX record lookup on top of these same format checks.
In practice, most teams combine this kind of format check with a periodic re-validation pass, since email addresses naturally decay over time as people change jobs or providers shut down old accounts — a list that was 98% valid a year ago may look quite different today.
No. Validation runs entirely in JavaScript in your browser. The address you type never leaves your device, and this page makes no network request to check it.
Yes. An address can be perfectly well-formed and still bounce if the mailbox has been deleted, the domain has no mail servers, or the account has run out of storage. Syntax validation is a first filter, not a guarantee of delivery.
Disposable providers like Mailinator or 10 Minute Mail issue temporary inboxes that expire after a short window, often used to bypass signup verification. This checker flags known disposable domains so you can decide whether to accept them.
Role addresses are usually read by multiple people or a ticketing system rather than one person, which affects things like personalization and deliverability reputation on marketing sends. It's a flag, not necessarily a reason to reject the address.
No. SMTP verification connects to the receiving mail server and asks whether it will accept mail for that address. This tool checks format and known-domain patterns only, which is faster and fully private, but less certain.