title: MFMailComposeViewController uses too much memory
body: <p>When I try to send images as attachements(summar size ~4mb) by using MFMailCompose, activity monitor says, what 100(+-2)mb of memory is used. After sending or cancelling memory is freeing  ~20 megabytes, but what happened to the remaining 80 megabytes if shared item with images is deallocated?
  Thanks!:)</p>