The goal of most email campaigns is to get the prospect on the phone or into a meeting so you can qualify whether there is an opportunity or not. You can use a Lead Pipeline to keep track of how that effort is going. Here's one we often recommend:
Here's how the stages break down:
Not Started - this is a holding pen for new leads that you upload.
Approaching - you've begun your email / call campaign
Positive Response - you got a reply back and it was a good one
Call Scheduled - there is a call on the calendar
Call Held - the call on the calendar actually happened
You currently need to move leads from Not Started to Approaching at the same time you add them to a campaign. We're planning a feature to make that one action.
After running your campaign for a while, you'll be able to track how well leads move through the pipeline using the Lead Conversion Funnel report.