Workaround for Yahoo delete all email not working

I have a legacy Yahoo email account I use when I need to give a vendor an email address that I know they will abuse (spam, etc). Periodically I want to thousands of spam emails from the inbox.

Because this is 2025 the delete all function does not delete all. Often it seems to delete nothing.

The workaround is to search for '.' This finds all emails. Selecting all then clicks delete works. It doesn't only delete your inbox though, it deletes archives, folders, sent, etc.

Which is fine for my purposes.