Can I ask where you seeing are the best response from? We launched yesterday and we're only two people too.
One thing that helped a somewhat was to send them promo codes directly.
It's a painful task, sending all those emails and keeping track of those who replied, ignored, bounced back, etc... :)
What app did you guys release?
Good luck to you!
We launched a little travel magazine; www.overnightbuses.com
Good luck to you guys as well!