Can't delete emails

I had over 2,000 emails in Inbox, and was able to delete most of them. By the time I got down to the last 100, Hughes.net won't allow me to delete, nor move them into another folder.

I have also deleted many of the files in Trash, but toward the end it won't let me delete these either.

When deleting the Inbox orTrash folder, I click on all, select Delete, and click. It asks if I'm sure, YES, then it appears it works, however, the deleted files are still there.

PLEASE HELP!