This feature is called “Importance markers”. The “Important” folder is being added to your folder list as part of a feature of Gmail. How can I prevent my emails from being duplicated in this “Important” folder?
It also contains many emails that also exist in my Sent Items folders.
In this folder, I receive various emails which are also received in my Inbox folder. I’m connecting to my Gmail account via IMAP and in the folder list on the left, I also have a folder called “Important”.
