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Looking for recommendations to digitally signing/encrypting on-premise e-mail. &nbsp;A healthcare facility has asked us to research a solution to secure their e-mail. &nbsp;The customer currently hosts their own Exchange 2013 e-mail server and they aren't interested in moving their e-mail to anyone's cloud. &nbsp;What are some good options to digitally signing and securing their e-mail?
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Looking for recommendations to digitally signing/encrypting on-premise e-mail.  A healthcare facility has asked us to research a solution to secure their e-mail.  The customer currently hosts their own Exchange 2013 e-mail server and they aren't interested in moving their e-mail to anyone's cloud.  What are some good options to digitally signing and securing their e-mail?

On-premise Digitally Signed/Encrypted Secure E-mail Solutions

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.

Encryption

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.