The Campaign queue displays a list of campaigns that are either upcoming or have been recently deployed, and allows you to cancel any queued campaigns.
This tool shows you the number of unique email recipients and gives one of three statuses:
Done - Successfully deployed.
Queued - Upcoming.
Started - In the middle of deployment.
If at any point you wish to cancel a campaign, click the “cancel” button (as long as the campaign has not already been fully deployed).