The service provides validation of email addresses. It determines not only that an address has correct syntax and references a functional domain but also that it matches a valid account properly registered under the domain and configured to receive email. In this way, it ensures that email data submitted online or accessed from vendors represent deliverable addresses.
API methods support submission of an email address or list of addresses. For each one, the API returns a status of verified, disposable (provided by a service unusable for ongoing communications), unreachable (not connected to functional mail handlers), illegitimate, or undeliverable. Methods allow specific checks for full mailboxes, expired domains, and other common issues that prevent email delivery.