I know this tweak has been out for a few days but I thought I would share it with you. I personally have never got a redirect within the Mail app on iOS but it looks like it could be maliciously so this tweak would be something to keep in mind if you come across this problem. 

But what DeDirect does is stops the redirect from within the Mail app. There is nothing you need to setup just install and go. So if you have spam mail come in sometimes get DeDirect from Cydia.