In view of the limits on storage coming soon in April, it would help your customers enormously if we have the option of deleting messages in our inbox BEFORE A CERTAIN DATE.
The way the service is designed at present I am forced to spend literally hours selecting (checking in American English) thousands of emails before deleting a batch page by page. I've used Yahoo for a decade and a half or more, so I have thousands of emails, and I don't want to delete this year's or last year's ones in case they are still very relevant.