how to delete all mails in Gmail at once?
Unfortunately, there isn’t a convenient way to trim them right now. Instead of clicking a nifty button, you’ll need to hold down the Shift key instead of clicking it. Select the first email by pressing and holding Shift, then select the final email and press Delete.
Go to Gmail on your computer. The Gmail app isn’t capable of removing all emails. Select All at the top left. If you have more than a page of messages, choose to Select all conversations from the drop-down menu. Delete is the final step in this process.
You may remove individual emails by swiping from left to right on the message to reveal the “trash” name and icon. To delete several emails, go to the top right corner and select edit. Then press select all after that. After you’ve selected every email you want to eliminate, hit the trash.
Click More from the left side of the Gmail screen. After that, choose All Mail from the list. On the left side of the Gmail page, check the box next to Compose. On the top right corner of the Gmail page, select Delete all conversation links.
Go to Gmail on your computer. Open an email from the person you’d like to unsubscribe from. Unsubscribe or Change preferences may be found next to the sender’s name by clicking Unsubscribe or Changing preferences. If these options aren’t visible, see above for how to block the sender or mark the message as spam.