How to search for unread mails in Gmail? In order to search for unread mails in Gmail, go to the inbox settings further go to inbox type then from the drop down menu select “unread first” click “options” given next to “unread line” further click on the “save changes” button given at the bottom of the page further click on “continue” then in the inbox section you will get to see a separate “unread section and for more update visit at Gmail Helpline Number.