S/MIME in Enterprise Email
Explore S/MIME certificate-based email security used in corporate and government environments.
What Is S/MIME?
Secure/Multipurpose Internet Mail Extensions is a standard for public key encryption and signing of MIME data, which is the format used for email. Unlike PGP, S/MIME uses X.509 certificates issued by Certificate Authorities rather than a Web of Trust. It is built into most enterprise email clients, making deployment easier in managed environments.
Certificate-Based vs Key-Based Model
PGP relies on manually exchanging and trusting public keys. S/MIME relies on certificates that bind a public key to an email address and are signed by a trusted CA. The CA vouches for the identity of the certificate holder. If you trust the CA, you automatically trust certificates it issued, removing the need for individual key verification.