When you send someone an e-mail, chances are that you don't want anyone else to read it. In fact, sometimes it is imperative that the intended recipient and that person only can read it.
Hackers can intercept anyone's e-mail and read it.
When you encrypt your e-mail, you can be sure that only the person who has the key to decrypt, can read it. You can encrypt All of the contents of your e-mail, including attachments, Just an attachment, Just the message, or Only parts of the message. Decrypting an e-mail that has been encrypted by Privacy is simple. If the whole e-mail including any attachments is encrypted, all you have to do is type the encryption key and everything automatically decrypts. You need Privacy installed to do this.