Open the campaign from the Scheduled tab and click Edit Campaign (top right). You are taken back into the wizard with all values restored – name, subject, groups, exclusions, trigger values, tracking settings, content and schedule. When you save again, Sprwt deletes the old queued messages and rebuilds the recipient list from scratch using your current customer data, then re-checks the plan limit.

Editing is only possible while no email has been sent yet and the campaign is not cancelled. If you try to edit a campaign that already started sending you are redirected with Campaign already sent!; a cancelled one shows Campaign Canceled!. In those cases create a new campaign instead.