There is no working way to find large sized emails in yahoo. The suggestions online don't work there is no preferences or sort by size and the searches for has:attachment" or "size:1000" don't actually work. I've deleted everything that comes up with those searches and my mailbox size remains EXACTLY the same even after deleting from deleted and refreshing. When you radically reduce the size allowed for accounts it is YOUR RESPONSIBILITY TO PROVIDE REASONABLE OPTIONS FOR CUSTOMERS TO find and save or remove large emails, you are just a terrible company, wasting so much time for so many people to hold their accounts ransom.