A protocol for total email and collaborative software (e.g., Exchange-brand server) session security. By way of example, securing the traffic between two servers within the same organization or cross organizations is critical to maintaining privacy of electronic data and communications. For example, securing communications between two Exchange-brand servers is particularly useful for individuals and organizations that routinely send and receive confidential information via electronic mail. It is important for the receiving side (server) to authorize the sending side (client) to send the information; the sending side should authorize the receiving side to receive information to prevent unauthorized information disclosure. The novel system and/or protocol disclosed herein can provide a mutually authenticated, authorized, and encrypted channel between two servers both within the same organization and across disparate organizations.