Nowadays, so many advertising messages come to email boxes that sometimes you want to delete them in a bundle.
is:unreadin the Gmail search box, this will open a list of unread messages.
Searchbutton on the left (magnifying glass icon) or the
Enterbutton on your keyboard.
Allbutton. This will highlight all messages on the current page.
Select all conversations that match this searchbutton will appear above the list, press it.
Deletebutton in the activity panel
Here we go! You deleted all unread messages. In the same way, you can highlight all messages to mark them as read, not important, assign or remove a label, etc.
Once you have deleted a message, it will be moved to your shopping cart. They will be automatically deleted from your shopping cart after 30 days. But if you want to delete all messages from your Trash Bin right now: