Extending email security using PGP
    PGP
For 
iOS
 and Android
 devices, you can extend email security for device users by enabling PGP
. PGP
 protects email messages on devices using OpenPGP format. Users can sign, encrypt, or sign and encrypt email messages using PGP
 protection when they use a work email address. PGP
 cannot be enabled for personal email addresses.You enable 
PGP
 for users in an email profile. You can force iOS
 and Android
 device users to use PGP
, disallow the use of PGP
, or make it optional. When PGP
 use is optional (the default setting), a user can enable PGP
 on the device and specify whether to encrypt, sign, or encrypt and sign email messages.To sign and encrypt email messages, users must store 
PGP
 keys for each recipient on their devices. Users can store PGP
 keys by importing the files from a work email message.You can configure 
PGP
 using the appropriate email profile settings.