S/MIME (Secure/Multipurpose Internet Mail Extensions) is a standard for public key encryption and used for authentication, message integrity, digital signatures and encryption (data security). It ensures that the email message sent by a legitimate sender and provides encryption for incoming and outgoing messages. To use S/MIME, it requires sender and receiver to have an X.509 Client digital certificate for strong client authentication. The main obstacle in deploying S/MIME is the most complicated process and more difficult to scan incoming S/MIME messages which results in Malware threat. The Sixscape solves these problems by the Secure Email Client Add-in. It enables S/MIME more user-friendly and simple for everyone to send/receive secured and encrypted email.