We were sending an invoice to a client this morning when we ran into a problem with Mac Mail in Mavericks. The invoice, as a JPG, was showing up inline rather than as an attachment. This can be a major pain for the recipient of the email, as they will have trouble saving the picture.
We found that there is a simple way to get the attachment as an attachment rather than inline. Open terminal and type in the following:
defaults write com.apple.mail DisableInlineAttachmentViewing 1
Note – to get terminal up and going, go to Spotlight, type in TERMINAL, and it will pop up.