I found this while researching what appears to be a bug in Mail 10.0 (Sierra) that doesn't show inline attachments (such as photos) in some sent or received messages.
The way these settings work can be confusing (System Preferences sets preferences in certain apps. To change those settings, you need to use the app itself.)
The options for Mail did not help with my situation, and apparently only work for IMAP accounts.
Discussion of issues related to macOS Sierra
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