  Fermionic bound states (mesinos) of messengers can play the role of
right-handed neutrinos and due to their heavy masses they can realize the
seesaw mechanism providing light and heavy sterile neutrinos. We study simple
models with a single mesino to present the proof of principle. We extend our
analysis to three mesino states where after the seesaw mechanism, three light
and several heavy sterile neutrinos are obtained.
