Yahoo Mail used to, for a not terribly long period, an option to delete all emails in my inbox when I deleted one, but then stopped. I would very much like this to resume and for the option to list all incoming emails from related or highly similar sending people or bodies. That would help me reduce the size of my inbox which is huge and is vast majority spam companies or people I was interested for a time but am no longer so I am keen to rid my inbox of their footprints. I expect there are many more just like me. Thanks in advance.