When marketing to a big organizations you should contact as many people as possible, most of the time they have many departments that sometimes compete, lack internal communication and are ridden by awful politics. If they ever happen talk about your offering in a meeting they better be already prepared and familiar. - "Have you heard about CyberWalkAbout proposal?" - “Yes, they made Chicago 2011 Auto Show app, we should give them a call!”, instead of, "No, I'll check it later" which almost always means “never“. As always, if you send to multiple people a little personalization and human touch goes a long way.