PGP stands for "Pretty Good Privacy" and is a method for encrypting and decrypting email messages. PGP works by using public key encryption, where each user has a public key and a private key. The public key can be shared with anyone, while the private key is kept secret.
To send an encrypted email using PGP, the sender would use the receiver's public key to encrypt the message. Only the receiver's private key can be used to decrypt the message. This ensures that only the intended receiver can read the email.
PGP is also used for digital signatures, which can verify the authenticity of an email. The sender can use their private key to create a signature, which is added to the email. The receiver can use the sender's public key to verify the signature and ensure that the email was not tampered with in transit.
Overall, PGP provides a secure method for sending and receiving email messages, ensuring that only the intended receiver can read the message and that the message has not been tampered with during transmission.
As it is known, emails are written to the file system; by using PGP technology, no one will be able to read the emails.
To get details on how to use PGP on Roundcube of Servermx, please see the article on Help & How-to section