Communication is the base mechanism for coordination and collaboration in human activities, and it plays a fundamental role in enterprise environments. However current communication systems are not based on the message content, but they focus on the message transport and delivery. Furthermore the presence of several communication protocols and tools leads to heterogeneity in communications, implying difficulties in activity coordination. This paper presents an approach for communications based on the use of mobile agents, which can realize content filtering, and can unify several message systems in a single one.