2015/11/12
Disable Apple Mail attachment defaulting to inline
Did you know that Apple Mail does the presumptuous thing of sending all images (and maybe other attachment types) as inline attachments, no matter what options you choose in the program, like attaching at the end of message, like making it “Windows-friendly” (as if it’s a Windows problem),…. Nor does any of the very typically low-quality “solutions” you’ll find by misunderstanding Apple users online help, like changing message type to plain text or running that one silly line on the command line
defaults write com.apple.mail DisableInlineAttachmentViewing -bool yes
Just look at that and think about what it does! None of those do anything at all.
(Read the article)