Change mail back to embedding attachments I wanted to attach a photo and not embed it so I did the following:


  If you would like Mail to do this automatically with all attachments, try the following Terminal command:

defaults write com.apple.mail DisableInlineAttachmentViewing -bool yes

  
  Relaunch Mail for this to take effect.


How to automatically attach E-mail, not embed them

I only wanted to do this temporarily, but now can't change it back.  Can someone help me to change it back to automatically embedding photo?
defaults delete com.apple.mail DisableInlineAttachmentViewing