What are the four principal services provided by S/MIME?

Explanation:

Secure/Multipurpose Internet Mail Extensions, is a technology that permits you to encrypt your emails. S/MIME is based on asymmetric cryptography to protect your emails from unauthorized access. It also allows you to digitally sign your emails to verify you as the legitimate sender of the message, making it an effective weapon against many phishing attacks.

The four principal services presented by S/mime includes ;

Authentication, Non-repudiation of origin utilizing digital signatures, Message Integrity and message Privacy.