Help and Support for CleanEmail
Missing emails are usually emails processed by an Auto Clean rule or Smart Unsubscriber. This usually happens when you create “broad” rules like "Archive all emails in Social Notification folder”, “Trash all Dead-End emails”, "Remove all Unread emails", etc (just a few examples of rules we have seen over time.)
Unfortunately the software behind Clean Email does not “know” which emails are important for you and which are not, it only performs the actions you instructed it to. Although most of the time social notifications are useless, there may be cases when they are not. That is the same for dead-ends. Most dead-end emails are useless, but they can also be receipts, bank notifications, etc, which you may want to get/see. Even it there can be use case scenarios involving removal of all unread emails, most of the time that is not something you want to do.
The idea is similar for Smart Unsubscriber rules. A sender like "firstname.lastname@example.org" can mostly send useless emails, but occasionally can send important ones.
There are a few ways to solve this kind of issue: