1. A method, comprising: receiving an electronic message from a sender's address and destined for a recipient's address, the electronic message having an attached object, the object associated with a sender's legacy system; associating the sender's address and the recipient's address to a list of health care participant addresses; when both the sender's address and the recipient's address are matched to the list of health care participant addresses, then sending the electronic message to a rule-based engine; and when the sender's address and the recipient's address do not match the list of health care participant addresses, then receiving an identifier that associates the electronic message with another legacy system and with a non-participant legacy system.