Pretty Good Privacy (PGP) is a data encryption and decryption computer program that provides cryptographic privacy and authentication for data communication.
wp2pgpmail plugin allows you to receive encrypted emails from your visitors, without the need for them to use any specific software. To achieve this, the plugin only uses your PGP public key.
You must have the necessary software on your computer to create a PGP key pair, if you do not already have, and to read encrypted e-mails received from your WordPress site. There are several software for using PGP, here are the main ones:
Comparison of PGP software
The following table shows with which email client you can run the software: