System, method, and computer program product in a data processing system for blocking unwanted email messages

摘要

A system, method, and computer program product are disclosed for blocking unwanted email messages. A passcode is specified. An email message addressed to a recipient is then received within an email server. Prior to the recipient's client email application downloading the email message into the client email application, a determination is made regarding whether the passcode is included in the email message. The email message is then downloaded into the client email application only in response to a determination that the passcode is included in the email message.