You can always filter unwanted mails to trash, but if you want you can completely prevent mails from certain senders entering your inbox. For this you can block the sender whose mail you don’t want to receive anymore. Open a mail from the sender you want to block all you can just select the mail. Click more and from the drop down select block. You can also select "Send all future emails to Spam” or “delete all the existing mails” or if you want you can select both. Click OK after you have completed the process. Call yahoo customer support team to get meaningful solutions in UK to resolve diverse yahoo mail issues.