Mobile email bankruptcy

I was out having a catch-up and some food with a friend of mine over some food in Soho when I noticed the mail status on his iPhone:
Email bankruptcy
I asked him how it happened to which he replied: ‘you just get sent email that isn’t that interesting from people that you don’t know’.

On my Mac, I have rules to file emails away and junk mail detection built in. I am unhappy that the update to OS X Lion got rid of the ability to ‘bounce’ junk mail back to the sender as if my email box didn’t exist. But mobile devices like the iPhone and the iPad don’t have any of these facilities.

It looks like mobile email clients need a more advanced feature set.