Yahoo mail: your way to SPAM

“Good Morning, Mihai!  You have 33243 unread messages in your Inbox.”

How the heck does one delete so many messages?  CTRL-A works (select all) but when I press DEL my browser freezes.  I can't, of course, receive any more SPAM because my quota is already exceeded (“110%”).  The only way seems to be to manually select 20-30 messages and delete them.  If this process takes 10 seconds and assuming no other delays, I would need to repeatedly press the same clicks and keys for about 3 hours!

Grrr.