1. A method, performed in a data processing system, of disseminating a message sent by a sender, said message including addresses and content, wherein said addresses includes information pertaining to the sender of said message and all desired recipients of said message that were explicitly specified by the sender of said message, and wherein said content includes the remainder of the message other than said addresses, the method comprising the computer implemented steps of: associating a message content condition with an identity of a user of the data processing system; comparing the content of the message sent to a message content condition previously associated with the identity of a user to determine whether the condition is met by the content of the message; determining whether the condition is met by the content of the message; associating with the message the identity of a nonspecified user whose user identity is associated with a condition that is met by the content of the message, wherein a nonspecified user is a user who was not explicitly specified by the sender of the message as a desired recipient of the message; and routing the message to the nonspecified user whose nonspecified user identity is associated with the message, as a result of the association of a user identity with the message, wherein a nonspecified user identity is the user identity of a nonspecified user.