Postcode Anywhere is an "information-as-a-service" provider offering over 250 separate web services covering a broad range of business efficiency tools for address and data capture, validation and cleansing to geo-coding, mapping, and route planning and optimisation.
The Email validation API will validate email addresses at the point of capture. It will also verify the existence of an email address.
The API uses a number of protocols including REST, SOAP and XML-RPC. Responses can be formatted in XML, JSON, CSV, HTML and PDF.