Email Validator
Check if an email address is real. Syntax, disposable-domain, and mail server (MX) checks in one click.
Syntax — Checks the address against a practical, widely-used email pattern: a valid local part, an @ symbol, and a domain with at least one dot (a top-level domain). Catches typos and malformed addresses instantly.
Disposable Domain — Checks the domain against a curated list of well-known temporary/throwaway email providers (Mailinator, Guerrilla Mail, Yopmail, and similar). Useful for filtering low-quality signups — but the list can't catch every disposable service, since new ones appear constantly.
Mail Server (MX Record) — Queries the domain's DNS for MX records via the Google Public DNS API. If none exist, the domain cannot receive email at all — a strong signal the address is invalid, even if the syntax looks fine. This does not contact the mailbox or confirm the specific address exists, only that the domain is configured to receive mail.
About Email Validator
Email Validator checks an email address in three steps, entirely in your browser: syntax (a practical RFC 5322-style pattern), whether the domain belongs to a known disposable/throwaway email provider, and whether the domain actually has mail servers configured (an MX record check via the Google Public DNS API, dns.google/resolve). No email is ever sent and no mailbox is contacted — this confirms deliverability potential, not that a specific inbox exists. Nothing is logged or stored by FreeToolBox.