Go to Gmail on your computer. Check the box in the top left to select all emails. Select all conversations if you have more than one page of messages. Select Delete at the top.
Messages are deleted from your inbox. To get started, log in to your Gmail account as usual. Select all messages. Check a little box under the search bar to choose all displayed communications nSelect all conversations Delete All Messages Trash is emptied.
Select the checkbox next to each message in the list. Select all conversations that are displayed if you have more messages than are shown on the current page by clicking on the link Select all communications. To delete all mails, click on the trash can icon.
If you have a lot of junk emails in your Gmail inbox, then it’s likely that the bulk of them will be spread across many pages. Because Gmail’s inbox can handle a maximum of 100 emails per page, if the emails you want to delete span multiple pages, you’ll need to search and remove them in several steps.
Using Windows Live Mail, you may permanently delete your emails in a faster way. After it’s set up, go to your Inbox and press Ctrl-A then hit the delete button to get rid of all of your emails.