Do you have hundreds or even thousands of unread messages, sent or marked in with a custom label? If you want to delete them, you do not need to do it page by page, which can quickly take a long time. Here's how to remove them all at once.
1-In Gmail, displays the label of the messages to be deleted. To display all unread messages, you can use the is: unread operator in the search field.
2-Click the small right arrow in the selection box and click All.
3-All messages on the page are selected. Gmail offers you to select all the messages corresponding to your search. Click on it.
4-All messages are selected. Click the Delete button.
5-Confirm with OK.
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