About
Abstract API supplies data-validation and lookup APIs, including an email validation service. Its email checks cover address syntax, MX records and SMTP responses, with flags for characteristics such as disposable, free-provider, role and catch-all addresses. Responses can include a suggested correction and validation details.
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The service supports individual and bulk processing for signup forms, application workflows and mailing-list maintenance. Its documentation explains that catch-all behaviour limits confirmation of a specific mailbox. Abstract also provides phone, IP and other data APIs, which are separate from email validation.
Published customer stories include Prompt Cowboy for address validation at signup and Fillout for adding email checks to its Conversion Kit.
