Encrypting e-mail and other digital communication methods (e.g. IM, P2P, BlackBerrys, etc.) is taking on new importance these days as businesses open new channels for employees, customers, and partners to pass messages to one another. Today’s versions use reliable ciphers and strong cipher keys. S/MIME is often the enterprise choice for encrypting and authenticating e-mails. PGP can be intimidating for first-time users and requires that both sender and receiver have PGP.”]
Source: https://www.csoonline.com/article/2633142/protecting-e-mail-confidentiality.html