idisk minor issue

[PDACPA]

I was playing around with idisk last night on my iphone. I put some files in my idisk. Then on my iphone I openned the idisk app and picked a file. I pressed the little icon that looks like a tilted wifi icon. It calls up an email to "share" the file. When you start typing in the TO field of the email the iphone does not suggest emails it already knows. I was just testing it by sending to my work email and I had to type the entire email address. I realize you can hit the blue icon to the right and get your whole contact list, but why does it not auto suggest email addresses like it does with a normal email?