OGame adds the action icon "Espionage" to the eventlist only if you attack someone (also disappears on return).
Please
add this Espionage-button to all missions to foreign coordinates, also
persisting on return: means for transport, acs defend, espionage and
harvest (if there is a planet and a moon, then you send probes to the
target setted on default, wich you can choose in the infopanel).