Security is our big priority but you need S/MIME Certificates or PGP keys to digitally sign and encrypt your emails, or decrypt and read encrypted emails from others. You may get the necessary certificates from your company's intranet system, from an independent security source like VeriSign, or from your correspondent that encrypts their emails.
With our new PGP support you can even create your own PGP keys directly inside eM Client - go to the Certificates and Keys section to find out more about that.
General settings for Signing and Encryption determine how long will your password for your certificate/key be remembered within the application and which format of encryption is to be preferred.
PGP Support
PGP/MIME format lets you encrypt and sign the whole message, including attachments.
Inline PGP encrypts the OpenPGP sections directly inside an email message and cannot encrypt/sign attachments.