Email Validator is a free online service from mediazz GmbH that helps individuals and businesses assess email addresses and domains using public technical signals. Its tools check address syntax, domain reachability, DNS records such as MX, A, and AAAA, and matches against known disposable-email domains. Users can validate a single address, review a list for syntax issues, duplicates, and disposable addresses, or inspect a domain’s public mail-routing and authentication signals. The service also provides provider information and practical guides covering topics such as email syntax, MX records, validation limits, and delivery problems.

Email Validator is designed for use without registration or sending a message. The site says it does not retain raw email addresses, though it may store a technical record containing a one-way hash, domain, source, and result for service operations. Its results indicate whether an address appears technically plausible; they do not confirm mailbox existence or ownership, nor guarantee delivery. The broader MapiCore tools collection also includes validators for IBAN, barcodes, VAT, UID, and EU Inc. records.