In order to view the questions in a timely fashion, I subscribe to some tags on SE, and created a label (subbox) in my Gmail named `stackoverflow`. I receive lots of unread mails day after day and now I want to mark all mails under this label as read in a quick way, but I didn't see any options in the menu to do this.

The maximum items in a page is 100, if I do this page by page, I need to go through 50 pages to mark all the mails. It would be time-consuming.

Any ideas?

![enter image description here][1]


  [1]: https://i.sstatic.net/KUnCm.png