Cracking post from JP (November 23 2010) with a cheeky 8 steps for reaction campaigns in Reactivating and Engaging Inactive Email Recipients in 8 Steps.
It can be hard to let go of addresses until you’ve suffereded the consequences once but then it’s even hard to come back from. As I said in Dangerous Reconnections getting it wrong can really get you in trouble and this post can really save you from yourself.
One strength of this scenario is that we presume that the list has been emailed regularly and the hard bounces handled efficiently thus removing the possibility of any old addresses turning into spam traps after hard bouncing for a while, if you want to follow this make sure you are in the position. If you are not talk to your ESP, consultant (or me)…read on