What is the Inbox? IncrediSupporter Updated February 13, 2018 07:50 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 to correct an Email Account that does not send/receive? What is the Sent Items folder? Comments 0 comments Article is closed for comments.