There's a checkbox in the header line. If you check that, it checks all of the e-mails. Then click on "Delete" and they're all gone.
I use gmail via pop3, but if I can't ssh into my home computer to send an e-mail, I can http to gmail.com and post from there.
It deletes 1 page at a time and how do I get to the last page so I can start there?