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That one is answered in the manual, in step-by-step form. assign an SIN Operative to do an espionage mission to that planet as soon as you start the game. (before you get the message) and the assign a ship to a passive military mission to that planet. (prefferably a fox class since they are stealth ships, and wait a little before sending the ship so the SIN guy can pack his bags)
then do the same after getting the message.

nice game, but it gets harder as you go. the manual has a very detailed set of instructions up until it really gets hard and I strongly suggest you read them. (reunion gets harder the farther in you go also)