A mediation server for controlling contents of incoming and outgoing communication information exchanged as part of a conversation is provided. The mediation server may be a centralized server between an internal (private) network and an external network, utilized for enforcing the internal network's policy and detecting a potential security compromise in the internal network. Predefined evaluation criteria are utilized to enforce internal policy or security policy within the internal network. When communication information is exchanged, the mediation server may monitor potential policy or security breaches in the communication information utilizing the predefined evaluation criteria and execute an appropriate action to prevent potential policy or security breaches.