An exhaust system for an internal combustion engine, especially for the internal combustion engine of a vehicle, includes an exhaust gas duct (12) carrying an exhaust gas stream (A) and a reactant release arrangement (18) for releasing a reactant ® into the exhaust gas stream (A). A bypass flow generation arrangement (25) generates a bypass flow (M) surrounding the reactant stream ® that is released from the reactant release arrangement (18).