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Smart Messages (SMs) are dynamic collections of code and data that migrate to nodes of interest in the network and execute on these nodes. A key challenge in programming pervasive computing environments using SMs is the ability to route SMs to nodes named by content. This paper describes the SM self-routing mechanism, which allows SMs to route themselves at each hop in the path toward a node of interest. SM applications can choose among multiple content-based routing algorithms, switch dynamically the routing algorithm in use, or even implement the best suited routing algorithm for their needs. The main benefits provided by self-routing are high flexibility and resilience to adverse network conditions. To demonstrate these benefits, we present proof-of-concept implementation, simulation results, and analysis for the SM self-routing mechanism using several content-based routing algorithms. We also show preliminary results for SM routing algorithms executed over our SM prototype implementation.