PGP, or Pretty Good Privacy, is a data encryption and decryption program that provides cryptographic privacy and authentication for data communication. In INETAPP it is used for securing email communication.
Here's a brief rundown of how it works: PGP uses a combination of symmetric-key and public-key cryptography. Each user has a pair of keys - a public key that is shared openly and a private key that is kept secret. When someone wants to send you an encrypted message, they use your public key to encrypt it. Only you, with your private key, can decrypt and access the original message.
In the INETAPP PGP public keys are used to encrypt outgoing emails. If an email will be sent to multiple recipients, including users whose public keys we know for encryption and users who will not receive encrypted emails, then multiple emails will be sent.
The INETAPP can read-in encrypted email content from postboxes. It will detect either encrypted email sections, such as Multiparts, as well as encrypted plain text mail bodies and attempts to decrypt them using your private keys.
While reading emails, new public keys are detected and stored securely on the server.
For email decryption to properly work, you have to have your INETAPP server set up with the appropriate private keys.