A SDE system and a computer program product for secure data communication are provided herein. In one embodiment, the SDE system includes: (1) a processor and (2) a SDE client configured to determine if a document is a secure data document and if not, determine if a user is authorized to create secure data having a predetermined extension by verifying authentication code associated with the user, wherein the authentication code is based on an email address and a user defined identifier associated with the user. If authorized, the SDE client configured to employ a plurality of converters to create a secure data document and direct an electronic mail system to send the secure data document to recipients of a recipients email list provided by the user, wherein the secure data document includes a predetermined extension.