Yes. You can edit a campaign that you have scheduled to send if it has not sent yet, but you CANNOT edit a campaign that is in the process of sending or has already sent. To do this, click EDIT under the name of the campaign under Campaigns.
Most of the time, subscribers aren’t receiving campaigns because they’re stuck in SPAM filters. Here are a couple of things you can ask your subscribers to do: Ask subscribers to add your reply-to email address to their contact list. If they’ve already added the reply-to email address to their contact