Catalyzes the hydrolysis of the trilactone cycle of ferri-bacillibactin (ferri-BB) complex, leading to the formation of bacillibactin monomers and to cytosolic iron release, thus making iron available for metabolic use. Can also hydrolyze bacillibactin (BB), however the catalytic efficiency for ferri-BB hydrolysis is much higher than for BB. Repressed by fur in the presence of iron. Impaired growth during iron limitation conditions and a strong accumulation of intracellular ferri-bacillibactin. Belongs to the esterase D family.