European researchers have found that the popular PGP and S/MIME email encryption standards are vulnerable to being hacked and they urge users to disable and uninstall them immediately.

University researchers from Muenster and Bochum in Germany, and Leuven in Belgium, discovered the flaws in the encryption methods that can be used with popular email applications such as Microsoft Outlook and Apple Mail.
https://in.reuters.com/article/us-cyber-encryption/popular-encrypted-email-standards-are-unsafe-researchers-idINKCN1IF1LL