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Applicability Statement 1 ( AS1 ) is a standard for secure data transport by e-mail using the SMTP protocol combined with an acknowledgment of receipt, referred to in AS language as Message Disposition Notification (MDN), with which the sender can prove delivery on time can.

Most messages for Electronic Data Interchange (EDI) are transmitted with AS1 .

Norms and standards

AS1 is standardized as a Request for Comments (RFC):

  • RFC 3335 - MIME-based Secure Peer-to-Peer Business Data Interchange over the Internet, September 2002