title: MFMailComposeViewController configure mimetype for attachment
body: <p>I need some help.
  I am trying to attach files to mail using,
  [mail addAttachmentData:attachmentData mimeType:@"image/png" fileName:fileName];
  but the problem is that if i need to send a .jpeg image i need to repeat code just for setting mime type to "mimeType:@"image/jpeg".
  My question is that is there any general mimeType that can attach any kind of file irrespective of .doc,.ppt,.pdf or an audio or video file.
  is there any general mimeType: for an kind of attachment.</p>
  
  <p>Thanks in advance.</p>