Click Trash along the left side of any Gmail page. (If you don't see Trash along the left side of your Gmail page, go to the Labels tab in Settings, then click the show link next to the Trash label.) Locate the message you'd like to move to your inbox, and check the box next to the sender's name. Click Move to Inbox.
Can you recover a deleted email?
Restore deleted email messages in Outlook.com. When you accidentally delete an email message from your Outlook.com email, you can recover those items if they're still in your Deleted Items or Junk Email folder, and in some cases you can even recover items after the Deleted Items folder is emptied.
Can you recover deleted emails from Yahoo mail?
Losing important emails or accidentally deleting emails that you still need can be frustrating. Good news is that Yahoo! Mail provides ways to retrieve deleted messages. In case your "Trash" folder is emptied, you can still recover deleted messages using Yahoo's "Restore" feature.