New to iphone (5)

All

Iphone 5 is my first apple phone.

I get a boatload of junk mail sent to me on my Iphone. I have to go into junk and delete each junk mail and it's moved to the trash. Then I can select trash and empty them all at once.

Silly question. Is there a way I can automically have the mail moved from the junk folder to the trash folder when it is sent to me?

Any suggestion welcome