A message creator encodes message information into an original message. The message creator transmits the original message to a message recipient via a first medium. The message recipient receives the original message and decodes the original message to extract the encoded message information. The message recipient adds and/or modifies an attribute of the original message and re-encodes the message information in a modified message. The computer system transmits the modified message as if it were transmitted from the message creator to the message recipient. One attribute that the message recipient may modify is the message medium. As a result, the modified message may be transmitted via a different medium than the original message.