How to permanently delete a permanently deleted email yahoo

I have a draft email from a year and half ago. It shows up every time I start yahoo mail, even though I have deleted it literlly a hundred times. It keeps showing up.

I tried saving it and deleting it.  Still shows up.

I tried sending it and deleting it, Still shows up.

This is the stupidest thing I have seen in my life. Delete means delete, not keep showing up.

Cleared the cache at least 125 times. No exxageration.

Tried five browsers. Keeps showing up when I start yahoo mail.

Cleared each of those caches at least a hundred times. Keeps showing up.

Yahoo mail is so freaken stupid I want to hit my monitor repeatedly.

Why does this happen? ?Delete means delete. Go away. F*** off. Yet it keeps coming back.

Why?

It is so stupid I need to break something.