Technically, since some list members' email servers may be down, we cannot guarantee exactly how many people will receive your campaign.
We tell you how many people we will try to send it to. That number is based on the criteria you selected when targeting your list. We calculate how many current list members match your selections and show you that number when you are scheduling your campaign).
However, if you schedule delivery for sometime in the future instead of immediately, it is possible that your campaign will be sent to more or less people. You could get new list members or your current list members may unsubscribe from your list by the time of your scheduled delivery.