What is the Inbox? IncrediSupporter Updated October 26, 2016 08:34 Follow The IncrediMail Inbox is the Main Folder where all your New Messages will be when you receive them, unless you have Protection Center, or Messages Rules set for Incoming Messages. Related articles How do I open IncrediMail? What is the Outbox, and where can I find it? What are IncrediMail's Default Folders? What Email Account Setup options can I use? How can I sort my Folders? Comments 0 comments Article is closed for comments.